https://doi.org/10.1140/epjd/s10053-026-01118-x
Research - Plasmas
Impact of magnetic islands on edge plasma rotation in J-TEXT tokamak
State Key Laboratory of Advanced Electromagnetic Technology, International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China
a
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Received:
19
November
2025
Accepted:
8
January
2026
Published online:
29
January
2026
The behavior of toroidal and poloidal rotations in the edge region is studied in the presence of locked m/n = 2/1 and m/n = 3/1 magnetic islands, excited by Resonant Magnetic Perturbations (RMPs) on the J-TEXT tokamak. When the 2/1 magnetic island is present, a significant change in the toroidal rotation of carbon V (C4+) is observed, with the reversing from the counter-current to the co-current direction. In contrast, the 3/1 magnetic island has a weaker effect on C4+ rotation but strongly influences the rotation of carbon III (C2+), which is closer to the 3/1 island. RMP phase scans show that the toroidal rotation change of C2+ increases as it approaches the O-point of the magnetic island. This region corresponds to a more positive radial electric field Er on the outer side of the 3/1 magnetic island, as measured by electric probes.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2026
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.
