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Effet des fluctuations turbulentes sur l’équilibre d’ionisation dans les plasmas de bord de tokamak et modèle collisionnel-radiatif moléculaire

par Caroline CHAMPENOIS - publié le , mis à jour le

séminaire pour spécialistes

mercredi 5 novembre, 11:00 service 322

Francisco Guzmán Fulgencio,
laboratoire PIIM (groupe DGP)

Résumé :
Impurities sputtered from the plasma facing components are present in the edge of fusion plasmas. Transport codes such as SOLPS (used for the ITER divertor design) account for these impurities but in most current modeling efforts, the ionization-recombination equilibrium for impurities neglects the effect of fluctuations on source terms. However, these effects may not be negligible in the Scrape–Off Layer (SOL). Fluctuations can shift ionization stages towards lower temperature areas, when transport is not taken into account. A set of passive tracers has been implemented in a non-isothermal version of the turbulence code TOKAM2D to describe the different charge states of impurities. Comparisons have been performed for Be and W between the local ionization balance calculated using the average density and temperature profiles, and calculations including first only transport in the ExB velocity field and then also source averaging effects.
The second part of the talk deals with the proper modeling of molecular processes in the edge plasma. The latter can be determinant for plasma detachment modeling and diagnostic issues. A new molecular collisional-radiative model has been build for diatomic molecules and applied to H2. The scarce collisional data available have been completed by new calculations and effective rate coefficients are obtained and stored. Also spectroscopic quantities directly related to experiments, such as PEC or D/XB and S/XB can be calculated by the code.

Contact : Yannick Marandet

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