Mode structure symmetry breaking of reversed shear Alfvén eigenmodes and its impact on the generation of parallel velocity asymmetries in energetic particle distribution

Guo MENG; Philipp LAUBER; Xin WANG; Zhixin LU

doi:10.1088/2058-6272/ac3d7b

Plasma Science and Technology > 2022 > 24(2): 025101. > DOI: 10.1088/2058-6272/ac3d7b

Guo MENG, Philipp LAUBER, Xin WANG, Zhixin LU. Mode structure symmetry breaking of reversed shear Alfvén eigenmodes and its impact on the generation of parallel velocity asymmetries in energetic particle distribution[J]. Plasma Science and Technology, 2022, 24(2): 025101. DOI: 10.1088/2058-6272/ac3d7b

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Mode structure symmetry breaking of reversed shear Alfvén eigenmodes and its impact on the generation of parallel velocity asymmetries in energetic particle distribution

Max-Planck-Institut für Plasmaphysik, D-85748 Garching, Germany

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Corresponding author:
Guo MENG, E-mail: guo.meng@ipp.mpg.de

Zhixin LU, E-mail: luzhixin@ipp.mpg.de
Received Date: August 04, 2021
Revised Date: November 17, 2021
Accepted Date: November 24, 2021
Available Online: February 22, 2024
Published Date: January 25, 2022

Graphical Abstract

Abstract

Abstract

In this work, the gyrokinetic eigenvalue code LIGKA, the drift-kinetic/MHD hybrid code HMGC and the gyrokinetic full-f code TRIMEG-GKX are employed to study the mode structure details of reversed shear Alfvén eigenmodes (RSAEs). Using the parameters from an ASDEX-Upgrade plasma, a benchmark with the three different physical models for RSAE without and with energetic particles (EPs) is carried out. Reasonable agreement has been found for the mode frequency and the growth rate. Mode structure symmetry breaking (MSSB) is observed when EPs are included, due to the EPs' non-perturbative effects. It is found that the MSSB properties are featured by a finite radial wave phase velocity, and the linear mode structure can be well described by an analytical complex Gaussian expression with complex parameters σ and s₀, where s is the normalized radial coordinate. The mode structure is distorted in opposite manners when the EP drive shifted from one side of to the other side, and specifically, a non-zero average radial wave number $\left\langle k_s\right\rangle$ with opposite signs is generated. The initial EP density profiles and the corresponding mode structures have been used as the input of HAGIS code to study the EP transport. The parallel velocity of EPs is generated in opposite directions, due to different values of the average radial wave number $\left\langle k_s\right\rangle$ , corresponding to different initial EP density profiles with EP drive shifted away from the .
- reversed shear Alfvén eigenmode,
- symmetry breaking,
- energetic particles,
- non-perturbative effects

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Acknowledgments

The authors would like to thank Dr. F. Zonca, Dr. X. Garbet and Dr. Simon Pinches for fruitful discussions, partially within the EUROFUSION Enabling Research Projects Projects 'NLED' (ER15-ENEA-03), 'NAT' (CfP-AWP17-ENR-MPG-01), 'MET' (ENR-MFE19-ENEA-05) and 'ATEP' (ENR-MOD.01.MPG). This work has been carried out within the framework of the Eurofusion Consortium and has received funding from the Euratom research and training programme 2014–2018 and 2019–2020 under grant agreement No. 633 053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

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