Abstract
Nonlinear evolution of tearing instability with a poloidal mode number m =1 and a toroidal mode number n =0 is studied in a straight helical system with an \(\imath{=}0\) surface, where \(\imath\) denotes a rotational transform. On the basis of a low beta resistive MHD model derived by using the stellarator expansion, it is shown that the m =1/ n =0 magnetic island grows to cover the whole central region; then, plasma current is readjusted and it almost recovers the initial profile. The large magnetic island causes outflow of ions, since the level of poloidal field fluctuations reaches about 10%. This whole process seems to repeat and may explain relaxation oscillations of ion temperature detected by neutral particle analyzer in the Heliotron E experiment.
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