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TJ-II:Radiation asymmetries and potential variations: Difference between revisions
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TJ-II:Radiation asymmetries and potential variations (view source)
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== Experimental campaign == | == Experimental campaign == | ||
2018 | 2018 Autumn | ||
== Proposal title == | == Proposal title == | ||
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== Name and affiliation of proponents == | == Name and affiliation of proponents == | ||
José M García Regaña<sup>1</sup>, D. Carralero<sup>1</sup>, M. A. Ochando<sup>1</sup>, T. Estrada<sup>1</sup>, F. Medina<sup>1</sup>, José Luis Velasco<sup>1</sup>, J. A. Alonso <sup>1</sup> and TJ-II team. | José M García Regaña<sup>1</sup>, D. Carralero<sup>1</sup>, M. A. Ochando<sup>1</sup>, T. Estrada<sup>1</sup>, M. Ezzat<sup>1</sup>, F. Medina<sup>1</sup>, José Luis Velasco<sup>1</sup>, J. A. Alonso <sup>1</sup>, B. López-Miranda, D. Tafalla and TJ-II team. | ||
== Details of contact person at LNF (if applicable) == | == Details of contact person at LNF (if applicable) == | ||
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with <math>\theta</math> and <math>\phi</math> the poloidal and toroidal angular coordinates. | with <math>\theta</math> and <math>\phi</math> the poloidal and toroidal angular coordinates. | ||
When this is taken into account the equilibrium density of the different species ''a'' present in the plasma | When this is taken into account the equilibrium density of the different species ''a'' present in the plasma | ||
varies | varies accordingly since <math>n_{a0}=n_a0(r)\exp\left(-Z_{a}e\Phi_1/T_{a}\right)</math>. | ||
This can introduce a strong density variation of impurities due to their high charge state. In TJ-II plasmas experiments and simulations | |||
<ref>M. A. Pedrosa ''et al.'', ''Electrostatic potential variations along flux surfaces in stellarators'' Nucl. Fusion '''55''' 052001 (2015) </ref> | <ref>M. A. Pedrosa ''et al.'', ''Electrostatic potential variations along flux surfaces in stellarators'' Nucl. Fusion '''55''' 052001 (2015) </ref> | ||
<ref>J. M. Garcı́a-Regaña ''et al.'' ''Electrostatic potential variation on the flux surface and its impact on impurity transport'' Nuclear Fusion '''57''' 056004 (2017)</ref> | <ref>J. M. Garcı́a-Regaña ''et al.'' ''Electrostatic potential variation on the flux surface and its impact on impurity transport'' Nuclear Fusion '''57''' 056004 (2017)</ref> | ||
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*Accessing different absolute values and regimes <math>E_{r}</math> is essential. These regimes can be roughly referred to as "high ion root <math>E_{r}</math>", "low ion root <math>E_{r}</math>" and the same for electron root conditions. 2 discharges for each regime is necessitated in order to characterize <math>E_{r}</math> at different positions over the same flux surface. | *Accessing different absolute values and regimes <math>E_{r}</math> is essential. These regimes can be roughly referred to as "high ion root <math>E_{r}</math>", "low ion root <math>E_{r}</math>" and the same for electron root conditions. 2 discharges for each regime is necessitated in order to characterize <math>E_{r}</math> at different positions over the same flux surface. | ||
*Reproducing some of these regimes in two different configurations (high-iota and standard), where changes in the the sign of <math>E_{r}^{Left}-E_{r}^{Right}</math> have been observed, is planned. | *Reproducing some of these regimes in two different configurations (high-iota and standard), where changes in the the sign of <math>E_{r}^{Left}-E_{r}^{Right}</math> have been observed, is planned. | ||
*Good stationarity of plasma parameters at the instant where the impurities are injected is required in order to extract the stationary background emissivity from that produced by the injected impurity. | *Good stationarity of plasma parameters at the instant where the impurities are injected is required in order to extract the stationary background emissivity from that produced by the injected impurity. | ||
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* The time evolution of the plasma emissivity along the available lines of sight of the tomography camera systems. | * The time evolution of the plasma emissivity along the available lines of sight of the tomography camera systems. | ||
* The | * The radial electric field profile using Doppler reflectometry (DR), measured on the right and left side (respect to the normal incidence angle) of the DR measurement plane. | ||
* The time evolution of the line-averaged density <math>\left<n_e(t)\right></math> with interferometry. | * The time evolution of the line-averaged density <math>\left<n_e(t)\right></math> with interferometry. | ||
* The radial profiles of electron density <math>n_{e}(r, t_0)</math> and temperature at one time instant <math>t_0</math> using Thomson Scattering (TS). | * The radial profiles of electron density <math>n_{e}(r, t_0)</math> and temperature at one time instant <math>t_0</math> using Thomson Scattering (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. | * The time evolution of the electron temperature profile <math>T_{e}(r,t)</math> with Electron Cyclotron Emission (ECE), when available, calibrated with TS. | ||
* When possible the time evolution of the main ion temperature profile <math>T_{ | * When possible the time evolution of the main ion temperature profile <math>T_{i}(r,t)</math> with the CNPA are four positions that are representative of the inner and mid-core and mid- and far edge. | ||
== Preferred dates and degree of flexibility == | == Preferred dates and degree of flexibility == | ||
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== References == | == References == | ||
<references /> | <references /> | ||
<hr> | |||
[[TJ-II:Experimental proposals|Back to list of experimental proposals]] | |||
[[Category:TJ-II internal documents]] | |||
[[Category:TJ-II experimental proposals Autumn 2018]] | |||