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Conference Papers Year : 2021

Impurity transport in collisionless trapped-particle-driven turbulence (IAEA-FEC poster)

Maxime Lesur
Etienne Gravier
K. Lim
  • Function : Author
Chabha Djerroud
  • Function : Author
Malik Idouakass
  • Function : Author
  • PersonId : 1065161
Xavier Garbet

Abstract

We analyse properties of the radial turbulent transport of light to heavy impurities due to trapped-particle-driven turbulence in the core of tokamaks. In particular, we describe how they depend on impurity concentration, charge, mass, gradients, and on the nature of the underlying turbulence – dominated by either Trapped Electron Modes (TEM) or Trapped Ion Modes (TIM). This work is based on a gyrokinetic bounce-averaged model for trapped particles in a simplified tokamak geometry. When the equilibrium density gradient and temperature gradient are equal, the concentration of W40+ tungsten significantly impacts both density and heat transport for concentrations above 3x10-4. This limits the validity of the usual passive treatment (in the sense that they are not included in Maxwell equations) of impurities. The diffusive impurity transport decreases slightly with increasing mass number, and depends much strongly on the charge number: it increases (decreases) with the charge number Z for TEM (TIM) turbulence. Thermo-diffusion pinch and curvature pinch are also studied. Again the direction of thermo-diffusion depends on the nature of the turbulence, and on the impurity temperature profile. Finally the direction of the curvature pinch is investigated as a function of the magnetic shear. Quasi-linear theory qualitatively explains the gyrokinetic numerical observations.
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Dates and versions

hal-04595265 , version 1 (31-05-2024)

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  • HAL Id : hal-04595265 , version 1

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Maxime Lesur, Etienne Gravier, K. Lim, Chabha Djerroud, Malik Idouakass, et al.. Impurity transport in collisionless trapped-particle-driven turbulence (IAEA-FEC poster). IAEA Fusion Energy Conference 2021, May 2021, Nice, France. ⟨hal-04595265⟩
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