Three different schemes to realize a very low-
qdischarge (
qa< 2) have been demonstrated in the TORIUT tokamaks. They are (1) fast current-rise method, (2) application of the ergodization effect of non-resonant helical field, and (3) high filling-pressure operation. Each method has been proved to be independently effective to suppress the major disruption caused by the (m=2, n=1) tearing mode during the current rising-up phase and provides a path into the very low-
qregime through the barrier at
qa=2.
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