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

Nuclear Fushion

article

K. Ichiguchi¹  Y. Suzuki¹  Y. Todo¹  S. Sakakibara¹  K. Ida¹  Y. Takemura¹  M. Sato¹  L.E. Sugiyama³  B.A. Carreras⁴ 

[1] National Institute for Fusion Science;The Graduate University for Advanced Studies;Massachusetts Institute of Technology;BACV Solutions Inc.

关键词: magnetohydrodynamics (MHD);    numerical simulation;    non-resonant mode;    partial collapse;    large helical device (LHD);   

DOI  :  10.1088/1741-4326/ac3292

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

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, wheremandnare 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.

【 授权许可】

Unknown