Measurements of hard x-ray emission from runaway electrons in DIII-D
作者： A.N. James , M.E. Austin , N. Commaux , N.W. Eidietis , T.E. Evans
DOI: 10.1088/0029-5515/52/1/013007
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摘要: The spatial distribution of runaway electron (RE) strikes to the wall during argon pellet-initiated rapid shutdown diverted and limited plasma shapes in DIII-D is studied using a new array hard x-ray (HXR) scintillators. Two configurations were investigated: an elongated H-mode low-elongation L-mode. HXR emission from MeV level REs generated pellet injection observed thermal quench (TQ) discharges lost into divertor. In limiter discharges, this prompt TQ loss reduced, suggesting improved confinement configuration. During plateau phase when current carried by REs, toroidally symmetric remaining confined seen. Transient bursts RE suggest presence small losses due unidentified instability. Eventually, abrupt final occurs. This shows strong toroidal peaking consistent spatiotemporal evolution that suggests development kink
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