https://doi.org/10.1140/epjs/s11734-025-01756-z
Regular Article
Effects of q-profile and central plasma pressure on nonlinear evolution of m/n = 2/1 double tearing mode
College of Nuclear Equipment and Nuclear Engineering, Yantai University, 264005, Yantai, China
a
xqlu@ytu.edu.cn
b
guowei@ytu.edu.cn
Received:
22
January
2025
Accepted:
16
June
2025
Published online:
4
July
2025
The influence of the q-profile and the plasma pressure at the magnetic axis on the nonlinear evolution of the m/n = 2/1 double tearing mode (DTM) is systematically studied using the CLT code. The correlation between the formation of secondary islands, the growth of the main mode, the collapse of central plasma pressure, and the pressure stabilization effect is analyzed for the first time. At a greater distance between the reversed magnetic shear (RMS) region and the magnetic axis, the non-negligible effect of secondary islands results in core or off-axis pressure collapses. An increase in central plasma pressure prevents the occurrence of 2/1 DTM explosion. For different q-profiles, the transition pressure between explosive reconnection and no explosion differs, and the order in which pressure stabilizes the two explosive reconnections also varies.
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© The Author(s), under exclusive licence to EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature 2025
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.
