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TJ-II:Impurity density and potential asymmetries: Difference between revisions
TJ-II:Impurity density and potential asymmetries (view source)
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== Experimental campaign == | == Experimental campaign == | ||
2017 Spring | 2017 Spring | ||
[[File:Photo_2018-07-20_09-32-57.jpg |thumb|right|500px| Figure 1. | |||
Numerical vs Experiment electron-root #45477 discharge: | |||
(a,b) Numerical impurity density asymmetry parameter <math>\alpha_{nZ}</math> and the | |||
experimental radiation asymmetry parameter <math>\alpha_{rad}</math> respectively at the toroidal plane | |||
<math>\phi=14.5^{\circ}</math> that corresponds the SXR toroidal measurement plane. (c,d) Numerical | |||
impurity density asymmetry parameter <math>\alpha_{nZ}</math> and the experimental radiation asymmetry | |||
parameter <math>\alpha_{rad}</math> respectively at the toroidal plane <math>\phi=75.5^{\circ}</math> that corresponds | |||
the Bolometery toroidal position. Note the numerical and experimental scale sare | |||
the same <math>[-0.38, 0.38]</math>. Since neon impurities were puffed at trave levels during the discharges, the numerical | |||
results in (a,c) have considered <math>Z_{I}=10</math>, i.e. they have assumed fully ionization of Ne on the whole | |||
effective radius <ref> M. Ezzat ''Advanced neoclassical impurity transport | |||
modelling with experimental comparison for TJ-II'' Master Thesis (2018)</ref>]] | |||
[[File:Photo_2018-07-20_09-33-36.jpg |thumb|right|500px| Figure 2. Same as in figure 1. but considering the ion-root discharge #45469 <ref> M. Ezzat ''Advanced neoclassical impurity transport | |||
modelling with experimental comparison for TJ-II'' Master Thesis (2018)</ref>]] | |||
== Proposal title == | == Proposal title == | ||
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== Name and affiliation of proponent == | == Name and affiliation of proponent == | ||
José M García Regaña<sup>1</sup>, | José M García Regaña<sup>1</sup>, M. Ezzat<sup>1</sup>, B. van Milligen<sup>1</sup>, M. A. Ochando <sup>1</sup>, F. Medina<sup>1</sup>, | ||
José Luis Velasco<sup>1</sup>, J. A. Alonso <sup>1</sup>, I. Calvo <sup>1</sup>, C. Hidalgo<sup>1</sup>, K. McKarthy<sup>1</sup> | |||
# Fusion National Laboratory, CIEMAT, 28040, Madrid, Spain | # Fusion National Laboratory, CIEMAT, 28040, Madrid, Spain | ||
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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 according to their adiabatic response and can be written as: <math>n_{a0}=\ | varies according to their adiabatic response and can be written as: <math>n_{a0}=\langle n\rangle\exp\left(-Z_{a}e\Phi_1/T_{a}\right)</math>, with | ||
<math>\ | <math>\langle...\rangle</math> the flux-surface-average. 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>B Liu ''et al.'' ''Direct experimental evidence of potential asymmetry in magnetic flux surfaces in stellarators'' to be submitted (2017) </ref> | <ref>B Liu ''et al.'' ''Direct experimental evidence of potential asymmetry in magnetic flux surfaces in stellarators'' to be submitted (2017) </ref> | ||
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at different radial locations. | at different radial locations. | ||
The application of fluid tools is also foreseen for the comparison between simulations and with the experimental results. | The application of fluid tools is also foreseen for the comparison between simulations and with the experimental results. | ||
== Description of required resources == | == Description of required resources == | ||
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* The time evolution of the plasma emissivity radial profile via tomographic reconstructions of the bolometry system signals. | * The time evolution of the plasma emissivity radial profile via tomographic reconstructions of the bolometry system signals. | ||
* The time evolution of the plasma floating potential at the outer core region (<math>r/a\sim 0.9</math>). | * The time evolution of the plasma floating potential at the outer core region (<math>r/a\sim 0.9</math>). | ||
* The time evolution of the line-averaged density <math>\ | * The time evolution of the line-averaged density <math>\langle n_e(t)\rangle</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. | ||
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== Preferred dates and degree of flexibility == | == Preferred dates and degree of flexibility == | ||
Preferred dates: (format dd-mm-yyyy) | Preferred dates: (format dd-mm-yyyy) | ||
== Results == | |||
== References == | == References == | ||
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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]] | ||