http://wiki.fusenet.eu/fusionwiki/index.php?title=TJ-II:_impact_of_impurities_on_turbulence&feed=atom&action=historyTJ-II: impact of impurities on turbulence - Revision history2024-03-29T11:52:29ZRevision history for this page on the wikiMediaWiki 1.39.5http://wiki.fusenet.eu/fusionwiki/index.php?title=TJ-II:_impact_of_impurities_on_turbulence&diff=7110&oldid=prevJose.regana at 09:07, 20 January 20222022-01-20T09:07:34Z<p></p>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>In the context of gyrokinetic theory, the stabilizing role of impurities on the Ion-Temperature-Gradient (ITG) driven instability has been known for decades, see e.g. <ref>R. R. Dominguez and M. N. Rosenbluth, Nuclear Fusion '''29''' 844 (1989).</ref>, where the linear dispersion relation analytically derived shows that the increase of the impurity concentration has a positive impact on the critical gradient of the toroidal ITG branch and its growth rate. Approaching the problem quasi-linearly, the benign impact of increasing the effective charge (<math>Z_{\text{eff}}</math>) on ITG stability was numerically confirmed in <ref>R. R. Dominguez and G. M. Staebler, Nuclear Fusion '''33''' 51 (1993).</ref> , albeit for the simplified slab geometry. In contrast, while the impact is found beneficial for the stability of the ITG mode, it is found deleterious for Trapped Electron Modes (TEMs) in the cited work. And, importantly, the stabilizing role of impurities on ITG vanishes when the impurity density profile is hollow, as found in <ref>J. Q. Dong and W. Horton, Phys. Plasmas '''2''' 3412 (1995)</ref>. These works underline the complexity of microturbulence in plasmas when its full multi-species character is taken into account.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>In the context of gyrokinetic theory, the stabilizing role of impurities on the Ion-Temperature-Gradient (ITG) driven instability has been known for decades, see e.g. <ref>R. R. Dominguez and M. N. Rosenbluth, Nuclear Fusion '''29''' 844 (1989).</ref>, where the linear dispersion relation analytically derived shows that the increase of the impurity concentration has a positive impact on the critical gradient of the toroidal ITG branch and its growth rate. Approaching the problem quasi-linearly, the benign impact of increasing the effective charge (<math>Z_{\text{eff}}</math>) on ITG stability was numerically confirmed in <ref>R. R. Dominguez and G. M. Staebler, Nuclear Fusion '''33''' 51 (1993).</ref> , albeit for the simplified slab geometry. In contrast, while the impact is found beneficial for the stability of the ITG mode, it is found deleterious for Trapped Electron Modes (TEMs) in the cited work. And, importantly, the stabilizing role of impurities on ITG vanishes when the impurity density profile is hollow, as found in <ref>J. Q. Dong and W. Horton, Phys. Plasmas '''2''' 3412 (1995)</ref>. These works underline the complexity of microturbulence in plasmas when its full multi-species character is taken into account.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The interest in these early works and on the question itself about the active role of impurities on the overall turbulence behavior has been brought to the front line of stellarator research by recent W7-X experiments <ref>R. Lunsford ''et al'' Phys. Plasmas '''28''' 082506 (2021) </ref>. In that work, the conclusions highlight the increase of up to a 30% in the central ion temperature that follows after the injection of non-trace amounts of Boron. Given the limitations found in W7-X to achieve high core ion temperature <ref>M. N. A. Beurskens ''et al''., Nuclear Fusion '''61''' 116072 (2021)</ref>, with the exception of scenarios with reduced turbulence, the motivation to systematically study the means to reduce the turbulence ion heat transport and, in particular, the deliberate injection of impurities are clear. In contrast with the afore-mentioned analytical and numerical works, that employ approximations of different kind or consider simplified geometries, the possibility to study the problem numerically in all its complexity is at hand. Multi-species gyrokinetic simulations with the codes stella<ref>M. Barnes ''et al''., J. Comp. Phys '''391''' 365 (2019)</ref>, have just become affordable and, indeed, have been reported in the stellarator literature for the first time only recently <ref>J. M. García-Regaña ''et al''., J. Plasma Phys. '''87'''(1) 855870103 (2021)</ref>. Preliminary stella simulations performed for W7-X, the stabilization of ITG is confirmed <del style="font-weight: bold; text-decoration: none;">for W7-X, see fig. 1 left, and the decrease of the heat flux of the ions is also found, see fig. 1 right</del>. </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The interest in these early works and on the question itself about the active role of impurities on the overall turbulence behavior has been brought to the front line of stellarator research by recent W7-X experiments <ref>R. Lunsford ''et al'' Phys. Plasmas '''28''' 082506 (2021) </ref>. In that work, the conclusions highlight the increase of up to a 30% in the central ion temperature that follows after the injection of non-trace amounts of Boron. Given the limitations found in W7-X to achieve high core ion temperature <ref>M. N. A. Beurskens ''et al''., Nuclear Fusion '''61''' 116072 (2021)</ref>, with the exception of scenarios with reduced turbulence, the motivation to systematically study the means to reduce the turbulence ion heat transport and, in particular, the deliberate injection of impurities are clear. In contrast with the afore-mentioned analytical and numerical works, that employ approximations of different kind or consider simplified geometries, the possibility to study the problem numerically in all its complexity is at hand. Multi-species gyrokinetic simulations with the codes stella<ref>M. Barnes ''et al''., J. Comp. Phys '''391''' 365 (2019)</ref>, have just become affordable and, indeed, have been reported in the stellarator literature for the first time only recently <ref>J. M. García-Regaña ''et al''., J. Plasma Phys. '''87'''(1) 855870103 (2021)</ref>. Preliminary stella simulations performed for W7-X, the stabilization of ITG is confirmed. </div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td></tr>
</table>Jose.reganahttp://wiki.fusenet.eu/fusionwiki/index.php?title=TJ-II:_impact_of_impurities_on_turbulence&diff=7109&oldid=prevJose.regana at 08:58, 20 January 20222022-01-20T08:58:31Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 09:58, 20 January 2022</td>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">== Proposal title ==</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">'''TJ-II: Impact of impurities on turbulence transport'''</ins></div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">== Name and affiliation of proponent ==</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[https://orcid.org/0000-0001-7632-3357 García-Regaña, J. M.], [https://orcid.org/0000-0001-0000-0000 Calvo, I.], [https://orcid.org/0000-0003-4236-7727 López-Miranda, B.], [https://orcid.org/0000-0003-1717-3509 Baciero, A.], [https://orcid.org/0000-0001-0000-0000 Estrada T.], [https://orcid.org/0000-0001-0000-0000 Carralero D.], [https://orcid.org/0000-0001-7521-4503 Ochando, M. A.], Medina, F., [https://orcid.org/0000-0002-5881-1442 McCarthy K. J.], [https://orcid.org/0000-0001-8510-1422 Velasco, J. L.] and the TJ-II team.</ins></div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">== Details of contact person at LNF ==</ins></div></td></tr>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Description of the activity ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Description of the activity ==</div></td></tr>
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</table>Jose.reganahttp://wiki.fusenet.eu/fusionwiki/index.php?title=TJ-II:_impact_of_impurities_on_turbulence&diff=7108&oldid=prevJose.regana at 08:47, 20 January 20222022-01-20T08:47:11Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 09:47, 20 January 2022</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Motivation.'''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>'''Motivation.'''</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>In the context of <del style="font-weight: bold; text-decoration: none;">analytical </del>theory, the stabilizing role of impurities on Ion-Temperature-Gradient (ITG) driven instability has been known for decades, see e.g. <ref>R. R. <del style="font-weight: bold; text-decoration: none;">Domínguez </del>and M. N. Rosenbluth, Nuclear Fusion '''29''' 844 (1989).</ref>, where the <del style="font-weight: bold; text-decoration: none;">derived </del>linear dispersion relation shows that the increase of the impurity concentration has a positive impact on the critical gradient of the toroidal ITG <del style="font-weight: bold; text-decoration: none;">mode </del>and its growth rate. Approaching the problem quasi-linearly, the benign impact of increasing the effective charge (<math>Z_{\text{eff}}</math>) on ITG stability was numerically confirmed in <ref>R. R. <del style="font-weight: bold; text-decoration: none;">Domínguez </del>and G. M. Staebler, Nuclear Fusion '''33''' 51 (1993).</ref> , albeit for the simplified slab geometry. In contrast, while the impact is found beneficial for the stability of the ITG mode, it is found deleterious for Trapped Electron Modes (TEMs) in the work <del style="font-weight: bold; text-decoration: none;">just cited</del>. And, importantly, the stabilizing role on ITG vanishes when the impurity density profile is hollow, as found in <ref>J. Q. Dong and W. Horton, Phys. Plasmas '''2''' 3412 (1995)</ref>. <del style="font-weight: bold; text-decoration: none;">Works like </del>the <del style="font-weight: bold; text-decoration: none;">ones just mentioned point out to a more complex description </del>of microturbulence in plasmas<del style="font-weight: bold; text-decoration: none;">, </del>when its full multi-species character is taken into account.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>In the context of <ins style="font-weight: bold; text-decoration: none;">gyrokinetic </ins>theory, the stabilizing role of impurities on <ins style="font-weight: bold; text-decoration: none;">the </ins>Ion-Temperature-Gradient (ITG) driven instability has been known for decades, see e.g. <ref>R. R. <ins style="font-weight: bold; text-decoration: none;">Dominguez </ins>and M. N. Rosenbluth, Nuclear Fusion '''29''' 844 (1989).</ref>, where the linear dispersion relation <ins style="font-weight: bold; text-decoration: none;">analytically derived </ins>shows that the increase of the impurity concentration has a positive impact on the critical gradient of the toroidal ITG <ins style="font-weight: bold; text-decoration: none;">branch </ins>and its growth rate. Approaching the problem quasi-linearly, the benign impact of increasing the effective charge (<math>Z_{\text{eff}}</math>) on ITG stability was numerically confirmed in <ref>R. R. <ins style="font-weight: bold; text-decoration: none;">Dominguez </ins>and G. M. Staebler, Nuclear Fusion '''33''' 51 (1993).</ref> , albeit for the simplified slab geometry. In contrast, while the impact is found beneficial for the stability of the ITG mode, it is found deleterious for Trapped Electron Modes (TEMs) in the <ins style="font-weight: bold; text-decoration: none;">cited </ins>work. And, importantly, the stabilizing role <ins style="font-weight: bold; text-decoration: none;">of impurities </ins>on ITG vanishes when the impurity density profile is hollow, as found in <ref>J. Q. Dong and W. Horton, Phys. Plasmas '''2''' 3412 (1995)</ref>. <ins style="font-weight: bold; text-decoration: none;">These works underline </ins>the <ins style="font-weight: bold; text-decoration: none;">complexity </ins>of microturbulence in plasmas when its full multi-species character is taken into account.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The interest in these early works and on the question itself about the active role of impurities on the overall turbulence behavior has been brought to the front line of stellarator research by recent W7-X experiments <ref>R. Lunsford ''et al'' Phys. Plasmas '''28''' 082506 (2021) </ref>. In that work, the conclusions highlight the increase of up to a 30% in the central ion temperature that follows after the injection of non-trace amounts of Boron. Given the limitations found in W7-X to achieve high core ion temperature <ref>M. N. A. Beurskens ''et al''., Nuclear Fusion '''61''' 116072 (2021)</ref>, with the exception of scenarios with reduced turbulence <del style="font-weight: bold; text-decoration: none;">where W7-X</del>, the motivation to study <del style="font-weight: bold; text-decoration: none;">systematically </del>the means to reduce the turbulence ion heat transport <del style="font-weight: bold; text-decoration: none;">is strongly motivated</del>. In contrast with the afore-mentioned analytical and numerical works, that employ approximations of different kind or consider simplified geometries, the possibility to study the problem numerically in all its complexity is at hand. Multi-species gyrokinetic simulations with the codes stella<ref>M. Barnes ''et al''., J. Comp. Phys '''391''' 365 (2019)</ref>, have just become affordable <del style="font-weight: bold; text-decoration: none;">recently </del>and, indeed, have been reported in the stellarator literature for the first time <del style="font-weight: bold; text-decoration: none;">in </del><ref>J. M. García-Regaña ''et al''., J. Plasma Phys. '''87'''(1) 855870103 (2021)</ref>. <del style="font-weight: bold; text-decoration: none;">In preliminary </del>stella simulations performed for W7-X, the stabilization of ITG is confirmed for W7-X, see fig. 1 left, and the decrease of the heat flux of the ions is also found, see fig. 1 right. </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The interest in these early works and on the question itself about the active role of impurities on the overall turbulence behavior has been brought to the front line of stellarator research by recent W7-X experiments <ref>R. Lunsford ''et al'' Phys. Plasmas '''28''' 082506 (2021) </ref>. In that work, the conclusions highlight the increase of up to a 30% in the central ion temperature that follows after the injection of non-trace amounts of Boron. Given the limitations found in W7-X to achieve high core ion temperature <ref>M. N. A. Beurskens ''et al''., Nuclear Fusion '''61''' 116072 (2021)</ref>, with the exception of scenarios with reduced turbulence, the motivation to <ins style="font-weight: bold; text-decoration: none;">systematically </ins>study the means to reduce the turbulence ion heat transport <ins style="font-weight: bold; text-decoration: none;">and, in particular, the deliberate injection of impurities are clear</ins>. In contrast with the afore-mentioned analytical and numerical works, that employ approximations of different kind or consider simplified geometries, the possibility to study the problem numerically in all its complexity is at hand. Multi-species gyrokinetic simulations with the codes stella<ref>M. Barnes ''et al''., J. Comp. Phys '''391''' 365 (2019)</ref>, have just become affordable and, indeed, have been reported in the stellarator literature for the first time <ins style="font-weight: bold; text-decoration: none;">only recently </ins><ref>J. M. García-Regaña ''et al''., J. Plasma Phys. '''87'''(1) 855870103 (2021)</ref>. <ins style="font-weight: bold; text-decoration: none;">Preliminary </ins>stella simulations performed for W7-X, the stabilization of ITG is confirmed for W7-X, see fig. 1 left, and the decrease of the heat flux of the ions is also found, see fig. 1 right. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the properties of turbulence and the transport it drives. In particular, the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO)) is desired. In order to provoke observable changes in the characteristics of the plasma turbulent behavior and performance, the impurities must be injected at non-tracer concentration, i.e. <math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions. To estimate the amount of impurities introduced and <del style="font-weight: bold; text-decoration: none;">their </del>localization, an estimate of the effective charge as well as the tomographic reconstruction of the radiation monitor signals will be of key importance. In that sense, the present proposal can greatly benefit from the <del style="font-weight: bold; text-decoration: none;">conclusions of </del>the proposal [http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II)]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the properties of turbulence and the transport it drives. In particular, the controlled injection of impurities with low to moderate charge state <ins style="font-weight: bold; text-decoration: none;">values </ins>(either with TESPEL or Laser Blow Off (LBO)) is desired. In order to provoke observable changes in the characteristics of the plasma turbulent behavior and <ins style="font-weight: bold; text-decoration: none;">its </ins>performance, the impurities must be injected at non-tracer concentration, i.e. <math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions. To estimate the amount of impurities introduced and <ins style="font-weight: bold; text-decoration: none;">its </ins>localization, an estimate of the effective charge as well as the tomographic reconstruction of the radiation monitor signals will be of key importance. In that sense, the present proposal can greatly benefit from the <ins style="font-weight: bold; text-decoration: none;">work carried out in </ins>the proposal [http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II)]</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== International or National funding project or entity ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== International or National funding project or entity ==</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Include funding here (grants, national plans)</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Description of required resources ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Description of required resources ==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>In order to assess the impact of the impurity injections in the plasma performance and turbulence, monitoring the time the evolution of the electron and ion temperature (<math>T_e</math> and <math>T_i</math>, respectively), as well as the <del style="font-weight: bold; text-decoration: none;">diagmagnetic </del>energy, will be essential. Ideally, <math>T_e</math> and <math>T_i/</math> <del style="font-weight: bold; text-decoration: none;">should </del>be measured at a radial position near to the that with largest impurity concentration and strongest impurity density gradient. If that information cannot be experimentally determined, <del style="font-weight: bold; text-decoration: none;">a position from </del>the inner core and mid-plasma radius will be chosen. Doppler Reflectometry (DR) fluctuation measurements radial <del style="font-weight: bold; text-decoration: none;">profiles </del>will be necessary in order to assess the changes in the amplitude of the turbulent density fluctuations. For modeling purposes, Thomson Scattering (TS) electron density (<math>n_e</math>) and temperature profiles shall be measured at <del style="font-weight: bold; text-decoration: none;">a </del>time <del style="font-weight: bold; text-decoration: none;">instant </del>of the <del style="font-weight: bold; text-decoration: none;">discharge</del>. <del style="font-weight: bold; text-decoration: none;">Whenever </del>available, <del style="font-weight: bold; text-decoration: none;">a </del><math>T_i</math> radial <del style="font-weight: bold; text-decoration: none;">profiles </del>will be highly valuable.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>In order to assess the impact of the impurity injections in the plasma performance and turbulence, monitoring the time the evolution of the electron and ion temperature (<math>T_e</math> and <math>T_i</math>, respectively), as well as the <ins style="font-weight: bold; text-decoration: none;">diamagnetic </ins>energy, will be essential. Ideally, <ins style="font-weight: bold; text-decoration: none;">the time evolution of </ins><math>T_e</math> and <math>T_i/</math> <ins style="font-weight: bold; text-decoration: none;">shall </ins>be measured at a radial position near to the that with largest impurity concentration and strongest impurity density gradient. If that information cannot be experimentally determined, <ins style="font-weight: bold; text-decoration: none;">two positions, one at </ins>the inner core and <ins style="font-weight: bold; text-decoration: none;">another at the </ins>mid-plasma radius will be chosen. Doppler Reflectometry (DR) fluctuation measurements <ins style="font-weight: bold; text-decoration: none;">along the </ins>radial <ins style="font-weight: bold; text-decoration: none;">coordinate </ins>will be necessary in order to assess the changes in the amplitude of the turbulent density fluctuations. For modeling purposes, Thomson Scattering (TS) electron density (<math>n_e</math>) and temperature profiles shall be measured at <ins style="font-weight: bold; text-decoration: none;">two </ins>time <ins style="font-weight: bold; text-decoration: none;">instants during the discharge, one previous to the injection </ins>of <ins style="font-weight: bold; text-decoration: none;">impurities and another shortly after </ins>the <ins style="font-weight: bold; text-decoration: none;">injection. If that were not possible, pairs of discharges with and without impurity injection would be necessary</ins>. <ins style="font-weight: bold; text-decoration: none;">If </ins>available, <ins style="font-weight: bold; text-decoration: none;">the </ins><math>T_i</math> radial <ins style="font-weight: bold; text-decoration: none;">profile </ins>will be highly valuable.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>As the impact on the plasma foreseen after the injection is expected to depend on how <del style="font-weight: bold; text-decoration: none;">the </del>impurities distribute radially, either forming a peaked or a hollow density profile, two plasma scenarios are to be looked at: a plasma scenario with predominantly ion-root ambipolar electric field throughout the hole plasmas, which should lead impurities to <del style="font-weight: bold; text-decoration: none;">peak</del>; and plasma scenario under broader core electron root and transition to ion root in the outer half of the plasma column. Whether those two scenarios are accessed by scanning the ECRH power and plasma density or by adding NBI to the heating <del style="font-weight: bold; text-decoration: none;">scheme </del>is left for discussion<del style="font-weight: bold; text-decoration: none;">, and the </del>decision will depend on how the different heating schemes constraint the quality and availability of the diagnostics data. </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>As the impact on the plasma foreseen after the injection is expected to depend on how impurities distribute radially, either forming a peaked or a hollow density profile, two plasma scenarios are to be looked at: a plasma scenario with predominantly ion-root ambipolar electric field throughout the hole plasmas, which should lead impurities to <ins style="font-weight: bold; text-decoration: none;">develop peaked profiles</ins>; and <ins style="font-weight: bold; text-decoration: none;">a </ins>plasma scenario under broader core electron root and transition to ion root in the outer half of the plasma column<ins style="font-weight: bold; text-decoration: none;">, which would lead to hollow density profiles</ins>. Whether those two scenarios are accessed by scanning the ECRH power and plasma density or by adding NBI to the heating <ins style="font-weight: bold; text-decoration: none;">scenario </ins>is left for discussion<ins style="font-weight: bold; text-decoration: none;">. The </ins>decision will depend on how the different heating schemes constraint the quality and availability of the diagnostics data. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Required resources:</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*</ins>Number of plasma discharges or days of operation: 40<ins style="font-weight: bold; text-decoration: none;">, approximately.</ins></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*</ins>Essential diagnostic systems: spectroscopic system, Bolometric arrays, X-Ray detectors, Doppler reflectometer, HIBP, VUV spectrometer, NPA system, ECE, Thomson Scattering.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Number of plasma discharges or days of operation: 40 <del style="font-weight: bold; text-decoration: none;">shots</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*</ins>Type of plasmas: standard configuration (100_44_64), ECRH (possibly NBI too). <ins style="font-weight: bold; text-decoration: none;">Density </ins>and ECRH power <ins style="font-weight: bold; text-decoration: none;">scan </ins>on a shot-to-shot basis so that the <ins style="font-weight: bold; text-decoration: none;">plasma </ins>transit from CERC to predominantly ion root conditions. In each shot, the injection of a different impurity source will be carry out in ideally stationary conditions.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Essential diagnostic systems: spectroscopic system, Bolometric arrays, X-Ray detectors, Doppler reflectometer, HIBP, VUV spectrometer, NPA system, ECE, Thomson Scattering.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*</ins>Specific requirements on wall conditioning if any: to be discussed.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Type of plasmas: standard configuration (100_44_64), ECRH (possibly NBI too). <del style="font-weight: bold; text-decoration: none;">Scan of density </del>and ECRH power on a shot-to-shot basis<del style="font-weight: bold; text-decoration: none;">, </del>so that <del style="font-weight: bold; text-decoration: none;">we </del>the <del style="font-weight: bold; text-decoration: none;">scenario of the different set of discharges </del>transit from CERC to predominantly ion root conditions. In each shot, the injection of a different impurity source will be carry out in ideally stationary conditions.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*</ins>External users need a local computer account for data access: no<ins style="font-weight: bold; text-decoration: none;">.</ins></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Specific requirements on wall conditioning if any: to be discussed.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">*</ins>Any external equipment to be integrated? Provide description and integration needs: None.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>External users<del style="font-weight: bold; text-decoration: none;">: </del>need a local computer account for data access: no</div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>Any external equipment to be integrated? Provide description and integration needs: None.</div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Preferred dates and degree of flexibility ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Preferred dates and degree of flexibility ==</div></td></tr>
</table>Jose.reganahttp://wiki.fusenet.eu/fusionwiki/index.php?title=TJ-II:_impact_of_impurities_on_turbulence&diff=7102&oldid=prevJose.regana at 14:47, 19 January 20222022-01-19T14:47:03Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:47, 19 January 2022</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l9">Line 9:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the turbulence <del style="font-weight: bold; text-decoration: none;">properties </del>and the transport it drives. In particular, the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO)) is desired. In order to provoke observable changes in the characteristics of the plasma turbulent behavior and performance, the impurities must be injected at non-tracer concentration, i.e. <math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions. To estimate the amount of impurities introduced and their localization, an estimate of the effective charge as well as the tomographic reconstruction of the radiation monitor signals will be of key importance. In that sense, the present proposal can greatly benefit from the conclusions of the proposal [http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II)]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the <ins style="font-weight: bold; text-decoration: none;">properties of </ins>turbulence and the transport it drives. In particular, the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO)) is desired. In order to provoke observable changes in the characteristics of the plasma turbulent behavior and performance, the impurities must be injected at non-tracer concentration, i.e. <math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions. To estimate the amount of impurities introduced and their localization, an estimate of the effective charge as well as the tomographic reconstruction of the radiation monitor signals will be of key importance. In that sense, the present proposal can greatly benefit from the conclusions of the proposal [http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II)]</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>In order to assess the impact of the impurity injections in the plasma performance and turbulence, monitoring the time the evolution of the electron and ion temperature (<math>T_e</math> and <math>T_i</math>, respectively), as well as the diagmagnetic energy, will be essential. Ideally, <math>T_e</math> and <math>T_i/</math> should be measured at a radial position near to the that with largest impurity concentration and strongest impurity density gradient. If that information cannot be experimentally determined, a position from the inner core and mid-plasma radius will be chosen. Doppler Reflectometry (DR) fluctuation measurements radial profiles will be necessary in order to assess the changes in the amplitude of the turbulent density fluctuations. For modeling purposes, Thomson Scattering (TS) electron density (<math>n_e</math>) and temperature profiles shall be measured at a time instant of the discharge. Whenever available, a <math>T_i</math> radial profiles will be highly valuable.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>In order to assess the impact of the impurity injections in the plasma performance and turbulence, monitoring the time the evolution of the electron and ion temperature (<math>T_e</math> and <math>T_i</math>, respectively), as well as the diagmagnetic energy, will be essential. Ideally, <math>T_e</math> and <math>T_i/</math> should be measured at a radial position near to the that with largest impurity concentration and strongest impurity density gradient. If that information cannot be experimentally determined, a position from the inner core and mid-plasma radius will be chosen. Doppler Reflectometry (DR) fluctuation measurements radial profiles will be necessary in order to assess the changes in the amplitude of the turbulent density fluctuations. For modeling purposes, Thomson Scattering (TS) electron density (<math>n_e</math>) and temperature profiles shall be measured at a time instant of the discharge. Whenever available, a <math>T_i</math> radial profiles will be highly valuable.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>As the impact on the plasma foreseen after the injection is expected to depend on how the impurities distribute radially, either forming a peaked or a hollow density profile, two plasma scenarios are to be looked at: a plasma scenario with predominantly ion-root ambipolar electric field throughout the hole plasmas, which should lead impurities to peak; and plasma scenario under broader core electron root and transition to ion root in the outer half of the plasma column. Whether those two scenarios are accessed by scanning the ECRH power and plasma density or by adding NBI to the heating scheme is left for discussion, and the decision will depend on how the different heating schemes constraint the quality and </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>As the impact on the plasma foreseen after the injection is expected to depend on how the impurities distribute radially, either forming a peaked or a hollow density profile, two plasma scenarios are to be looked at: a plasma scenario with predominantly ion-root ambipolar electric field throughout the hole plasmas, which should lead impurities to peak; and plasma scenario under broader core electron root and transition to ion root in the outer half of the plasma column. Whether those two scenarios are accessed by scanning the ECRH power and plasma density or by adding NBI to the heating scheme is left for discussion, and the decision will depend on how the different heating schemes constraint the quality and <ins style="font-weight: bold; text-decoration: none;">availability of the diagnostics data. </ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Required resources:</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">Required resources</del>:</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Number of plasma discharges or days of operation</ins>: <ins style="font-weight: bold; text-decoration: none;">40 shots</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Essential diagnostic systems: spectroscopic system, Bolometric arrays, X-Ray detectors, Doppler reflectometer, HIBP, VUV spectrometer, NPA system, ECE, Thomson Scattering.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Type of plasmas: standard configuration (100_44_64), ECRH (possibly NBI too). Scan of density and ECRH power on a shot-to-shot basis, so that we the scenario of the different set of discharges transit from CERC to predominantly ion root conditions. In each shot, the injection of a different impurity source will be carry out in ideally stationary conditions.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Specific requirements on wall conditioning if any: to be discussed.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">External users: need a local computer account for data access: no</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Any external equipment to be integrated? Provide description and integration needs: None.</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">* Number of plasma discharges or days of operation: </del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">* Essential diagnostic systems:</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">* Type of plasmas (heating configuration):</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">* Specific requirements on wall conditioning if any:</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">* External users: need a local computer account for data access: yes/no</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">* Any external equipment to be integrated? Provide description and integration needs:</del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Preferred dates and degree of flexibility ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Preferred dates and degree of flexibility ==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Preferred dates: (format dd-mm-yyyy)</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Preferred dates: (format dd-mm-yyyy)</div></td></tr>
</table>Jose.reganahttp://wiki.fusenet.eu/fusionwiki/index.php?title=TJ-II:_impact_of_impurities_on_turbulence&diff=7101&oldid=prevJose.regana at 14:38, 19 January 20222022-01-19T14:38:24Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:38, 19 January 2022</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the <del style="font-weight: bold; text-decoration: none;">turbulent </del>transport <del style="font-weight: bold; text-decoration: none;">and measured fluctuations</del>. In particular, the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO))<del style="font-weight: bold; text-decoration: none;">, </del>is desired. In order to provoke observable changes in the characteristics of the plasma turbulent behavior and <del style="font-weight: bold; text-decoration: none;">peformance</del>, the impurities must be injected at non-tracer <del style="font-weight: bold; text-decoration: none;">amount (</del><math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions<del style="font-weight: bold; text-decoration: none;">)</del>. To estimate the amount of impurities introduced and their localization, an estimate of the effective charge as well as the tomographic reconstruction of the radiation monitor signals will be of key importance. In that sense, the present proposal <del style="font-weight: bold; text-decoration: none;">is complementary to </del>[http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II)]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the <ins style="font-weight: bold; text-decoration: none;">turbulence properties and the </ins>transport <ins style="font-weight: bold; text-decoration: none;">it drives</ins>. In particular, the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO)) is desired. In order to provoke observable changes in the characteristics of the plasma turbulent behavior and <ins style="font-weight: bold; text-decoration: none;">performance</ins>, the impurities must be injected at non-tracer <ins style="font-weight: bold; text-decoration: none;">concentration, i.e. </ins><math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions. To estimate the amount of impurities introduced and their localization, an estimate of the effective charge as well as the tomographic reconstruction of the radiation monitor signals will be of key importance. In that sense, the present proposal <ins style="font-weight: bold; text-decoration: none;">can greatly benefit from the conclusions of the proposal </ins>[http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II)]</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
</table>Jose.reganahttp://wiki.fusenet.eu/fusionwiki/index.php?title=TJ-II:_impact_of_impurities_on_turbulence&diff=7099&oldid=prevJose.regana at 14:35, 19 January 20222022-01-19T14:35:33Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 15:35, 19 January 2022</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the turbulent transport and measured fluctuations. <del style="font-weight: bold; text-decoration: none;">The central actuator in the proposal will be </del>the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO))<del style="font-weight: bold; text-decoration: none;">. Possible choices could be the injection of LiF</del>, <del style="font-weight: bold; text-decoration: none;">BN, Fe</del>. In order to <del style="font-weight: bold; text-decoration: none;">induce </del>observable changes in the characteristics of the plasma <del style="font-weight: bold; text-decoration: none;">turbulence </del>and <del style="font-weight: bold; text-decoration: none;">performance</del>, the impurities must be injected at non-tracer amount (<math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions). To estimate the amount of impurities introduced and their localization, an estimate of the effective charge as well as <del style="font-weight: bold; text-decoration: none;">the evolution of </del>the tomographic reconstruction of the <del style="font-weight: bold; text-decoration: none;">bolometry and soft X rays (SXR) camera </del>will be of key importance. In that sense, the present proposal is complementary to <del style="font-weight: bold; text-decoration: none;">the proposal </del>[http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II) <del style="font-weight: bold; text-decoration: none;">''Zeff measurement using visible bremsstrahlung (VB) with NBI heating (II)''</del>]<del style="font-weight: bold; text-decoration: none;">.</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the turbulent transport and measured fluctuations. <ins style="font-weight: bold; text-decoration: none;">In particular, </ins>the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO)), <ins style="font-weight: bold; text-decoration: none;">is desired</ins>. In order to <ins style="font-weight: bold; text-decoration: none;">provoke </ins>observable changes in the characteristics of the plasma <ins style="font-weight: bold; text-decoration: none;">turbulent behavior </ins>and <ins style="font-weight: bold; text-decoration: none;">peformance</ins>, the impurities must be injected at non-tracer amount (<math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions). To estimate the amount of impurities introduced and their localization, an estimate of the effective charge as well as the tomographic reconstruction of the <ins style="font-weight: bold; text-decoration: none;">radiation monitor signals </ins>will be of key importance. In that sense, the present proposal is complementary to [http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II)]</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== International or National funding project or entity ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== International or National funding project or entity ==</div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Description of required resources ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Description of required resources ==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>In order to assess the impact of the injections in the plasma performance and turbulence <del style="font-weight: bold; text-decoration: none;">monitors</del>, monitoring the time the evolution of the electron and ion temperature (<math>T_e</math> and <math>T_i</math>, respectively), as well as the diagmagnetic energy, will be essential. Ideally, <math>T_e</math> and <math>T_i/</math> should be measured at a radial position near to the that with largest impurity concentration and strongest impurity density gradient. If that information cannot be experimentally determined, a position from the inner core and mid-plasma radius will be chosen. Doppler Reflectometry fluctuation measurements radial profiles will be necessary in order to assess the changes in the amplitude of the turbulent density fluctuations <del style="font-weight: bold; text-decoration: none;">after the impurity injections</del>. For modeling purposes, Thomson Scattering electron density (<math>n_e</math>) and temperature profiles shall be measured at a time instant of the discharge. Whenever available, a <math>T_i</math> radial profiles will be highly valuable.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>In order to assess the impact of the <ins style="font-weight: bold; text-decoration: none;">impurity </ins>injections in the plasma performance and turbulence, monitoring the time the evolution of the electron and ion temperature (<math>T_e</math> and <math>T_i</math>, respectively), as well as the diagmagnetic energy, will be essential. Ideally, <math>T_e</math> and <math>T_i/</math> should be measured at a radial position near to the that with largest impurity concentration and strongest impurity density gradient. If that information cannot be experimentally determined, a position from the inner core and mid-plasma radius will be chosen. Doppler Reflectometry <ins style="font-weight: bold; text-decoration: none;">(DR) </ins>fluctuation measurements radial profiles will be necessary in order to assess the changes in the amplitude of the turbulent density fluctuations. For modeling purposes, Thomson Scattering <ins style="font-weight: bold; text-decoration: none;">(TS) </ins>electron density (<math>n_e</math>) and temperature profiles shall be measured at a time instant of the discharge. Whenever available, a <math>T_i</math> radial profiles will be highly valuable.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>As the impact on the plasma foreseen after the injection is expected to depend on how the impurities distribute radially, either forming a peaked or a hollow density profile, two plasma scenarios are to be looked at: a plasma scenario with predominantly ion-root ambipolar electric field throughout the hole plasmas, which should lead impurities to peak; and plasma scenario under broader core electron root and transition to ion root in the outer half of the plasma column.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>As the impact on the plasma foreseen after the injection is expected to depend on how the impurities distribute radially, either forming a peaked or a hollow density profile, two plasma scenarios are to be looked at: a plasma scenario with predominantly ion-root ambipolar electric field throughout the hole plasmas, which should lead impurities to peak; and plasma scenario under broader core electron root and transition to ion root in the outer half of the plasma column. <ins style="font-weight: bold; text-decoration: none;">Whether those two scenarios are accessed by scanning the ECRH power and plasma density or by adding NBI to the heating scheme is left for discussion, and the decision will depend on how the different heating schemes constraint the quality and </ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* External users: need a local computer account for data access: yes/no</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* External users: need a local computer account for data access: yes/no</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Any external equipment to be integrated? Provide description and integration needs:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Any external equipment to be integrated? Provide description and integration needs:</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Preferred dates and degree of flexibility ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Preferred dates and degree of flexibility ==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Preferred dates: (format dd-mm-yyyy)</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Preferred dates: (format dd-mm-yyyy)</div></td></tr>
</table>Jose.reganahttp://wiki.fusenet.eu/fusionwiki/index.php?title=TJ-II:_impact_of_impurities_on_turbulence&diff=7096&oldid=prevJose.regana at 13:30, 19 January 20222022-01-19T13:30:23Z<p></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 14:30, 19 January 2022</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Description of required resources ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Description of required resources ==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>In order to assess the impact of the injections in the plasma performance and turbulence monitors, monitoring the time the evolution of the electron and ion temperature (<math><<del style="font-weight: bold; text-decoration: none;">T_e</del>/math> and <del style="font-weight: bold; text-decoration: none;">(</del><math><<del style="font-weight: bold; text-decoration: none;">T_i</del>/math>, respectively), as well as the diagmagnetic energy, will be essential. Ideally, <math><<del style="font-weight: bold; text-decoration: none;">T_e</del>/math> and <math><<del style="font-weight: bold; text-decoration: none;">T_i</del>/math> should be measured at a radial position near to the that with largest impurity concentration and strongest impurity density gradient. If that information cannot be experimentally determined, a position from the inner core and mid-plasma radius will be chosen. Doppler Reflectometry fluctuation measurements radial profiles will be necessary in order to assess the changes in the amplitude of the turbulent density fluctuations after the impurity injections. For modeling purposes, Thomson Scattering electron density (<math>n_e</math>) and temperature profiles shall be measured at a time instant of the discharge. Whenever available, a <math><<del style="font-weight: bold; text-decoration: none;">T_i</del>/math> radial profiles will be highly valuable.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>In order to assess the impact of the injections in the plasma performance and turbulence monitors, monitoring the time the evolution of the electron and ion temperature (<math><ins style="font-weight: bold; text-decoration: none;">T_e</ins></math> and <math><ins style="font-weight: bold; text-decoration: none;">T_i</ins></math>, respectively), as well as the diagmagnetic energy, will be essential. Ideally, <math><ins style="font-weight: bold; text-decoration: none;">T_e</ins></math> and <math><ins style="font-weight: bold; text-decoration: none;">T_i/</ins></math> should be measured at a radial position near to the that with largest impurity concentration and strongest impurity density gradient. If that information cannot be experimentally determined, a position from the inner core and mid-plasma radius will be chosen. Doppler Reflectometry fluctuation measurements radial profiles will be necessary in order to assess the changes in the amplitude of the turbulent density fluctuations after the impurity injections. For modeling purposes, Thomson Scattering electron density (<math>n_e</math>) and temperature profiles shall be measured at a time instant of the discharge. Whenever available, a <math><ins style="font-weight: bold; text-decoration: none;">T_i</ins></math> radial profiles will be highly valuable.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>As the impact on the plasma foreseen after the injection is expected to depend on how the impurities distribute radially, either forming a peaked or a hollow density profile, two plasma scenarios are to be looked at: a plasma scenario with predominantly ion-root ambipolar electric field throughout the hole plasmas, which should lead impurities to peak; and plasma scenario under broader core electron root and transition to ion root in the outer half of the plasma column.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>As the impact on the plasma foreseen after the injection is expected to depend on how the impurities distribute radially, either forming a peaked or a hollow density profile, two plasma scenarios are to be looked at: a plasma scenario with predominantly ion-root ambipolar electric field throughout the hole plasmas, which should lead impurities to peak; and plasma scenario under broader core electron root and transition to ion root in the outer half of the plasma column.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
</table>Jose.reganahttp://wiki.fusenet.eu/fusionwiki/index.php?title=TJ-II:_impact_of_impurities_on_turbulence&diff=7095&oldid=prevJose.regana at 13:28, 19 January 20222022-01-19T13:28:35Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
<col class="diff-marker" />
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<tr class="diff-title" lang="en">
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 14:28, 19 January 2022</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l9">Line 9:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the turbulent transport and measured fluctuations. <del style="font-weight: bold; text-decoration: none;">In particular, </del>the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO)), <del style="font-weight: bold; text-decoration: none;">is desired</del>. In order to <del style="font-weight: bold; text-decoration: none;">provoke </del>observable changes in the characteristics of the plasma <del style="font-weight: bold; text-decoration: none;">turbulent behavior </del>and <del style="font-weight: bold; text-decoration: none;">peformance</del>, the impurities must be injected at non-tracer amount (<math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions). To estimate the amount of impurities introduced and their localization, an estimate of the effective charge as well as the evolution of the tomographic reconstruction of the bolometry and soft X rays (SXR) camera will be of key importance. In that sense, the present proposal is complementary to [http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II) <del style="font-weight: bold; text-decoration: none;">/ </del>''Zeff measurement using visible bremsstrahlung (VB) with NBI heating (II)'']</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the turbulent transport and measured fluctuations. <ins style="font-weight: bold; text-decoration: none;">The central actuator in the proposal will be </ins>the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO))<ins style="font-weight: bold; text-decoration: none;">. Possible choices could be the injection of LiF</ins>, <ins style="font-weight: bold; text-decoration: none;">BN, Fe</ins>. In order to <ins style="font-weight: bold; text-decoration: none;">induce </ins>observable changes in the characteristics of the plasma <ins style="font-weight: bold; text-decoration: none;">turbulence </ins>and <ins style="font-weight: bold; text-decoration: none;">performance</ins>, the impurities must be injected at non-tracer amount (<math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions). To estimate the amount of impurities introduced and their localization, an estimate of the effective charge as well as the evolution of the tomographic reconstruction of the bolometry and soft X rays (SXR) camera will be of key importance. In that sense, the present proposal is complementary to <ins style="font-weight: bold; text-decoration: none;">the proposal </ins>[http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II) ''Zeff measurement using visible bremsstrahlung (VB) with NBI heating (II)'']<ins style="font-weight: bold; text-decoration: none;">.</ins></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== International or National funding project or entity ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== International or National funding project or entity ==</div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Description of required resources ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Description of required resources ==</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">In order to assess the impact of the injections in the plasma performance and turbulence monitors, monitoring the time the evolution of the electron and ion temperature (<math><T_e/math> and (<math><T_i/math>, respectively), as well as the diagmagnetic energy, will be essential. Ideally, <math><T_e/math> and <math><T_i/math> should be measured at a radial position near to the that with largest impurity concentration and strongest impurity density gradient. If that information cannot be experimentally determined, a position from the inner core and mid-plasma radius will be chosen. Doppler Reflectometry fluctuation measurements radial profiles will be necessary in order to assess the changes in the amplitude of the turbulent density fluctuations after the impurity injections. For modeling purposes, Thomson Scattering electron density (<math>n_e</math>) and temperature profiles shall be measured at a time instant of the discharge. Whenever available, a <math><T_i/math> radial profiles will be highly valuable.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">As the impact on the plasma foreseen after the injection is expected to depend on how the impurities distribute radially, either forming a peaked or a hollow density profile, two plasma scenarios are to be looked at: a plasma scenario with predominantly ion-root ambipolar electric field throughout the hole plasmas, which should lead impurities to peak; and plasma scenario under broader core electron root and transition to ion root in the outer half of the plasma column.</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Required resources:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>Required resources:</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Number of plasma discharges or days of operation: </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Number of plasma discharges or days of operation: </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Essential diagnostic systems:</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* Essential diagnostic systems:</div></td></tr>
</table>Jose.reganahttp://wiki.fusenet.eu/fusionwiki/index.php?title=TJ-II:_impact_of_impurities_on_turbulence&diff=7094&oldid=prevJose.regana at 13:02, 19 January 20222022-01-19T13:02:37Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 14:02, 19 January 2022</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l9">Line 9:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the turbulent transport and measured fluctuations. In particular, the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO)), is desired. In order to provoke observable changes in the characteristics of the plasma turbulent behavior and peformance, the impurities must be injected at non-tracer amount (<math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions). To estimate the amount of impurities introduced and their localization, an estimate of the effective charge as well as the tomographic reconstruction of the <del style="font-weight: bold; text-decoration: none;">radiation monitor signals </del>will be of key importance. In that sense, the present proposal is complementary to [http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II)]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the turbulent transport and measured fluctuations. In particular, the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO)), is desired. In order to provoke observable changes in the characteristics of the plasma turbulent behavior and peformance, the impurities must be injected at non-tracer amount (<math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <math>n_Z</math> the impurity density and <math>n_i</math> the density of the main ions). To estimate the amount of impurities introduced and their localization, an estimate of the effective charge as well as <ins style="font-weight: bold; text-decoration: none;">the evolution of </ins>the tomographic reconstruction of the <ins style="font-weight: bold; text-decoration: none;">bolometry and soft X rays (SXR) camera </ins>will be of key importance. In that sense, the present proposal is complementary to [http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II) <ins style="font-weight: bold; text-decoration: none;">/ ''Zeff measurement using visible bremsstrahlung (VB) with NBI heating (II)''</ins>]</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
</table>Jose.reganahttp://wiki.fusenet.eu/fusionwiki/index.php?title=TJ-II:_impact_of_impurities_on_turbulence&diff=7093&oldid=prevJose.regana at 12:59, 19 January 20222022-01-19T12:59:50Z<p></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
<col class="diff-marker" />
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 13:59, 19 January 2022</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>''' Proposal '''</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the turbulent transport and measured fluctuations. In particular, the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO)), is desired. In order to provoke observable changes in the characteristics <del style="font-weight: bold; text-decoration: none;">of the turbulence </del>of the plasma, the impurities must be injected at non-tracer amount (<math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <del style="font-weight: bold; text-decoration: none;">$</del>n_Z<del style="font-weight: bold; text-decoration: none;">$ </del>the impurity density and <del style="font-weight: bold; text-decoration: none;">$</del>n_i<del style="font-weight: bold; text-decoration: none;">$ </del>the density of the main ions). </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>The present proposal focuses on studying the impact of impurities on the turbulent transport and measured fluctuations. In particular, the controlled injection of impurities with low to moderate charge state (either with TESPEL or Laser Blow Off (LBO)), is desired. In order to provoke observable changes in the characteristics of the plasma <ins style="font-weight: bold; text-decoration: none;">turbulent behavior and peformance</ins>, the impurities must be injected at non-tracer amount (<math>Z^2 n_Z/n_i\sim 1</math>, with <math>Z</math> the charge state of the impurity, <ins style="font-weight: bold; text-decoration: none;"><math></ins>n_Z<ins style="font-weight: bold; text-decoration: none;"></math> </ins>the impurity density and <ins style="font-weight: bold; text-decoration: none;"><math></ins>n_i<ins style="font-weight: bold; text-decoration: none;"></math> </ins>the density of the main ions). <ins style="font-weight: bold; text-decoration: none;">To estimate the amount of impurities introduced and their localization, an estimate of the effective charge as well as the tomographic reconstruction of the radiation monitor signals will be of key importance. In that sense, the present proposal is complementary to [http://fusionwiki.ciemat.es/wiki/TJ-II:_Zeff_measurement_using_visible_bremsstrahlung_(VB)_with_NBI_heating_(II)]</ins></div></td></tr>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== International or National funding project or entity ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== International or National funding project or entity ==</div></td></tr>
</table>Jose.regana