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

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