Abstract
Resistive wall mode (RWM) instabilities are found to be a limiting factor in advancedtokamak regimes with low internal inductance. Even small amplitude modes can affect therotation profile and the performance of these ELMing H mode discharges. Although completestabilization of the RWM by plasma rotation has not yet been observed, several dischargeswith increased beam momentum and power injection sustained good steady state performancefor record durations. The first investigation of active feedback control of the RWM hasshown promising results: the leakage of radial magnetic flux through the resistive wall canbe successfully controlled and the duration of the high beta phase can be prolonged. Theresults provide a comparative test of several approaches to active feedback control, andare being used to benchmark the analysis and computational models of active control.
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