Effect of Applied Toroidal Electric Field on the Growth/Decay of Plateau-Phase Runaway Electron Currents in DIII-D
作者： E.M. Hollmann , P.B. Parks , D.A. Humphreys , N.H. Brooks , N. Commaux
DOI: 10.1088/0029-5515/51/10/103026
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摘要: Large relativistic runaway electron currents (0.1?0.5?MA) persisting for ~100?ms are created in the DIII-D tokamak during rapid discharge shut down caused by argon pellet injection. Slow upward and downward ramps were found response to externally applied loop voltages. Comparison between observed current growth/decay rate expected from knock-on avalanche mechanism suggests that classical collisional dissipation of runaways alone cannot account measured growth/damping rates. It appears a fairly constant anomalous order 10?s?1 exists, possibly stemming radial transport or direct orbit losses vessel walls, although possibility an apparent loss due profile shrinking be ruled out at present.
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