Dissemin is shutting down on January 1st, 2025

Published in

IOP Publishing, Nuclear Fusion, 12(61), p. 126056, 2021

DOI: 10.1088/1741-4326/ac3292

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Non-resonant global mode in LHD partial collapse with net toroidal current

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Abstract A transition from an interchange mode to a non-resonant mode is found in the nonlinear magnetohydrodynamic simulation for the partial collapse in a large helical device (LHD) plasma with a net toroidal current. This transition can occur when the magnetic shear is weak and the rotational transform is close to unity in the core region. In this transition, the mode number of the dominant Fourier component is reduced. As a result of the nonlinear evolution, the (m, n) = (1, 1) component can be dominant, where m and n are the poloidal and the toroidal mode numbers, respectively. This transition is considered to be a candidate to explain the observation in the LHD experiments with the net toroidal current that show partial collapses are caused by the (1, 1) mode.