https://doi.org/10.1140/epjp/s13360-022-03516-7
Regular Article
Influence of safety factor profile on energetic particle driven m/n > 1 instabilities in tokamak plasmas
Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong University, 610031, Chengdu, China
Received:
31
January
2022
Accepted:
19
November
2022
Published online:
30
November
2022
Effects of q-profile on energetic particle (EP) driven instabilities are investigated by solving the eigenvalue equation. It has been found that the radial structure of the m/n = 2/1 mode is different from that of the m/n = 1/1 kink mode, where m is the poloidal mode number, n is the toroidal mode number. Even though axial safety factor q0 > m/n, the mode still can be excited by EPs even transform to a non-resonant mode, similar to the result of reversed magnetic shear. Moreover, a flat q-profile not only leads to a significant destabilization of the modes but also modifies the mode structure. The locally flat of q-profile is also more prone to the onset of m/n = 2/1 EP-driven modes than the monotonic q-profile cases.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
