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TJ-II:Comparison of transport of on-axis and off-axis ECH-heated plasmas: Difference between revisions
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TJ-II:Comparison of transport of on-axis and off-axis ECH-heated plasmas (view source)
Revision as of 11:07, 27 March 2018
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'''Motivation.''' | '''Motivation.''' | ||
Particle transport of ECH plasmas | Particle transport of ECH plasmas<ref>Yokoyama 2005 NF</ref> is not well understood, as neoclassical simulations seem to overestimate the radial particle flux of on-axis heated ECH-plasmas; on the other hand, preliminary analyses show that this problem does not exist for off-axis ECH-heated plasmas. A comparison between these two situations (including neoclassical and gyrokinetic simulations and corresponding measurements) may shed some light on this problem, probably relevant for assessing the fuelling requirements of reactor plasmas<ref>Maassberg 1999 NF</ref>. Even if the results along this line are finally not conclusive, the experimental and theoretical characterization of turbulence with different profiles (peaked/hollow <math>T_e</math> with hollow/peaked <math>n_e</math>) is itself relevant. We will also have a look at impurity transport, as off-axis heated plasmas have been predicted to have negative radial electric field in the core and positive radial electric field closer to the edge, contrary to typical ECH plasmas. | ||
'''Objectives.''' | '''Objectives.''' | ||
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We will compare the measurements with neoclassical and gyrokinetic simulations. | We will compare the measurements with neoclassical and gyrokinetic simulations. | ||
== If applicable, International or National funding project or entity == | == If applicable, International or National funding project or entity == | ||
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- The time evolution of the line-averaged density <math><n_e(t)></math> with interferometry. | - The time evolution of the line-averaged density <math><n_e(t)></math> with interferometry. | ||
- The radial profiles of electron density <math>n_e(r,t_0)</math> and temperature <math>T_e(r,t_0)</math> at one time instant <math>t_0</math> with Thomson Scattering (TS). | - The radial profiles of electron density <math>n_e(r,t_0)</math> and temperature <math>T_e(r,t_0)</math> at one time instant <math>t_0</math> with Thomson Scattering (TS) and the He beam. | ||
- The time evolution of the electron temperature profile <math>T_e(r,t)</math> with Electron Cyclotron Emission (ECE), when available, calibrated with TS. | - The time evolution of the electron temperature profile <math>T_e(r,t)</math> with Electron Cyclotron Emission (ECE), when available, calibrated with TS. | ||
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[[Category:TJ-II internal documents]] | [[Category:TJ-II internal documents]] | ||
[[Category:TJ-II experimental proposals]] | [[Category:TJ-II experimental proposals 2017]] | ||