PASSIVE AND ACTIVE CONTROL OF MHD INSTABILITIES IN THE HBT-EP TOKAMAK

摘要

Experimental studies of the effects of adjustable close-fitting conducting shells and resonant magnetic perturbations on MHD instabilities have been carried out in the HBT-EP tokamak. Discharges formed with the conducting shells positioned close to the plasma achieved longer lifetimes and attained higher values of β_N without disrupting than did otherwise similar plasmas formed with the shells fully retracted. In a second series of experiments, mode locking of naturally-occurring m = 2, n = 1 magnetic fluctuations has been induced by applying a resonant magnetic perturbation using a highly-localized, toroidally-distributed array of saddle coils.