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research article

Extended drift-kinetic full-f turbulent simulation of a linear plasma device using the gyro-moment approach

Mencke, J. E.  
•
Ricci, P.  
March 31, 2025
Plasma Physics And Controlled Fusion

Turbulent full-f simulations in a linear plasma device are presented. Extending the work of Frei et al (2024 Phys. Plasmas 31 012301), the simulations are based on a drift-kinetic (DK) model that includes corrections associated with higher-order drifts and finite Larmor radius (FLR) effects, while avoiding the Boussinesq approximation. To solve the DK equation, the ion distribution function is expanded on a Hermite-Laguerre basis and the expansion coefficients, denoted as the gyro-moments (GMs), are evolved. Convergence is demonstrated with a small number of GMs and the ion distribution function is shown to be, approximately, a bi-Maxwellian distribution. The simulations reveal significantly reduced cross-field transport with respect to standard DK simulations. Turbulent structures are observed, predominantly elongated in the parallel direction, and largely unaffected by the number of GMs. Linear investigations of the unstable turbulent modes reveal the presence of a long-wavelength Kelvin-Helmholtz mode and a short-wavelength mode driven unstable by finite FLR corrections. The role of these modes in the nonlinear simulations is discussed.

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Type
research article
DOI
10.1088/1361-6587/adb6d4
Web of Science ID

WOS:001440320300001

Author(s)
Mencke, J. E.  

École Polytechnique Fédérale de Lausanne

Ricci, P.  

École Polytechnique Fédérale de Lausanne

Date Issued

2025-03-31

Publisher

IOP Publishing Ltd

Published in
Plasma Physics And Controlled Fusion
Volume

67

Issue

3

Article Number

035029

Subjects

drift kinetics

•

gyro moment

•

linear plasma device

•

full-f

•

turbulence

•

finite Larmor radius effects

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC-TH  
FunderFunding(s)Grant NumberGrant URL

Schweizerischer Nationalfonds zur Frderung der Wissenschaftlichen Forschung

101052200

Euratom

Swiss State Secretariat for Education, Research and Innovation (SERI)

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Available on Infoscience
March 18, 2025
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/247942
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