Abstract
To investigate the effect of magnetic compression on ultra-low q (ULQ) plasmas and the correlation between plasma-wall interaction and magnetohydrodynamics (MHD) phenomena, the toroidal magnetic compression is applied in REPUTE-1 ULQ plasmas. Although in this compression experiments plasma might not compressed adiabatically because the compression time of 0.3 ms is much longer than the energy confinement time ( τ E < 0.1 ms), the remarkable reduction of visible light emission is observed during the magnetic compression, and the contraction of the plasma column is also reconfirmed. After the magnetic compression, m = 1 and m = 2 modes take place and plasma-wall interaction is enhanced because the current channel is free from the shell. Since there are many rational surfaces in the ULQ region, the MHD phenomenon affects the plasma-wall interaction and the plasma confinement deeply.
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