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  4. Self-consistent gyrokinetic modeling of turbulent and neoclassical tungsten transport in toroidally rotating plasmas
 
research article

Self-consistent gyrokinetic modeling of turbulent and neoclassical tungsten transport in toroidally rotating plasmas

Lim, K.  
•
Garbet, X.
•
Sarazin, Y.
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August 1, 2023
Physics Of Plasmas

The effect of toroidal rotation on both turbulent and neoclassical transport of tungsten (W) in tokamaks is investigated using the flux-driven, global, nonlinear 5D gyrokinetic code GYSELA. Nonlinear simulations are carried out with different levels of momentum injection that drive W into the supersonic regime, while the toroidal velocity of the main ions remains in the subsonic regime. The numerical simulations demonstrate that toroidal rotation induces centrifugal forces that cause W to accumulate in the outboard region, generating an in-out poloidal asymmetry. This asymmetry enhances neoclassical inward convection, which can lead to central accumulation of W in cases of strong plasma rotation. The core accumulation of W is mainly driven by inward neoclassical convection. However, as momentum injection continues, roto-diffusion, proportional to the radial gradient of the toroidal velocity, becomes significant and generates outward turbulent flux in the case of ion temperature gradient turbulence. Overall, the numerical results from nonlinear GYSELA simulations are in qualitative agreement with the theoretical predictions for impurity transport.

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Type
research article
DOI
10.1063/5.0157428
Web of Science ID

WOS:001041657800005

Author(s)
Lim, K.  
Garbet, X.
Sarazin, Y.
Gravier, E.
Lesur, M.
Lo-Cascio, G.
Rouyer, T.
Date Issued

2023-08-01

Published in
Physics Of Plasmas
Volume

30

Issue

8

Article Number

082501

Subjects

Physics, Fluids & Plasmas

•

Physics

•

poloidal asymmetries

•

impurity transport

•

accumulation

•

density

•

impact

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
August 28, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/200261
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