MEASUREMENTS OF NON-AXISYMMETRIC HALO CURRENTS WITH AND WITHOUT "KILLER" PELLETS DURING DISRUPTIONS IN THE DIII-D TOKAMAK
作者： T.E. Evans , A.G. Kellman , D.A. Humphreys , M.J. Schaffer , P.L. Taylor
DOI: 10.1016/S0022-3115(97)80108-0
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摘要: Abstract Non-axisymmetric halo currents are always observed during disruptive instabilities in DIII-D. These appear to have a helical structure which rotates toroidally the electron current drift direction with frequencies ranging between 200 and 400 Hz prior initial plasma quench phase of disruption. Sometimes rotation locks at random toroidal angles quench. The total rarely exceeds 30% pre-disruptive ( I po ) peak-to-average peaking factors (TPF) usually less than 3 most disruptions. Neon ‘killer’ pellets proven very effective reducing both amplitude, often by as much 50%, TPF from ∼ 1.2.
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