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Conference Papers Year : 2021

Impurity transport in collisionless trapped-particle-driven turbulence

Maxime Lesur
Etienne Gravier
Kyungtak Lim
  • Function : Author
  • PersonId : 1065160
Malik Idouakass
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  • PersonId : 1065161

Abstract

The paper reports on properties of the radial turbulent transport of light to heavy impurities due to trapped-particledriven turbulence in the core of tokamaks, based on a gyrokinetic bounce-averaged model. The focus is on the effects of impurity concentration, charge, mass, gradientson impurity transport. The validity of the usual passive treatment of impurities is found to be limited to concentrations of W 40+ tungsten (respectively, C 6+ carbon) below 2x10-4 (1.4%). The diffusive impurity transport decreases slightly with increasing mass number. It depends strongly on the charge number Z, but the effect depends on the nature of turbulence: it increases with Z for turbulence dominated by Trapped Electron Modes (TEM) but decreases with Z for turbulence dominated by Trapped Ion Modes (TIM). The direction of thermo-diffusion also depends on the nature of the turbulence, and on the impurity temperature profile. Finally, the direction of the curvature pinch depends on magnetic shear: it is inward for a positive magnetic shear, while a negative magnetic shear prevents impurity core accumulation, in agreement with quasilinear theory.
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Dates and versions

hal-04326312 , version 2 (06-12-2023)
hal-04326312 , version 1 (31-05-2024)

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  • HAL Id : hal-04326312 , version 2

Cite

Maxime Lesur, Etienne Gravier, Kyungtak Lim, Chabha Djerroud, Malik Idouakass, et al.. Impurity transport in collisionless trapped-particle-driven turbulence. 28th IAEA Fusion Energy Conference, May 2021, Nice, France. ⟨hal-04326312v2⟩
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