Abstract
A Mirnov coil system has been used for detecting the MHD oscillations for two different types of discharge in the TCABR tokamak: the so called “runaway” discharges and the “resistive” plasma discharges. For the runaway discharges, characteristic spikes in the Vloop, Hα emission, hard X-rays and Mirnov coil signals are very strongly correlated. For the resistive plasma discharges, typical Mirnov oscillations are observed with frequencies in the range of 10 kHz to 15 kHz. These MHD oscillations are strongly induced 3 ms after the application of Alfvèn waves during the plasma discharge. Finally, operating the tokamak with resistive plasma at the high density limit, we calculate that the m=3MHD component dominates during almost the whole discharge, with an angular velocity of the magnetic islands estimated in ω=1.6×103 rad/s. Nevertheless, the modes m=2 and 4 are observed to be dominants before the occurrence of a major disruption, with ω=5.0×103 rad/s.
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