https://doi.org/10.1140/epjp/s13360-024-05516-1
Regular Article
Numerical analysis of global instability driven by circulating energetic particles in reversed magnetic shear plasmas
Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong University, 610031, Chengdu, China
Received:
10
February
2024
Accepted:
28
July
2024
Published online:
5
August
2024
The linear properties of the global instability induced by the circulating EPs with double rational surfaces are investigated by solving the eigenvalue equation. The top-hat structure of global energetic particle modes (EPMs) is generated in a cases with weak mode coupling, like the double kink mode. As mode coupling increases, a single peaking mode structure near the resonant surface emerges. In reversed magnetic shear plasmas, global instability exhibits a strong dependence on the value of 
and position 
related to the minimum safety factor 
, which may lead to mode conversion, such as between EPMs and Alfvén eigenmodes.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. 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.
