作者: EM Hollmann , ME Austin , JA Boedo , NH Brooks , N Commaux
DOI: 10.1088/0029-5515/53/8/083004
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摘要: DIII-D experiments on rapid shutdown runaway electron (RE) beams have improved the understanding of processes involved in RE beam control and dissipation. Improvements feedback enabled stable confinement out to volt-second limit ohmic coil, as well enabling a ramp down zero current. Spectroscopic studies shown that neutrals tend be excluded from centre. Measurements energy distribution function indicate broad with mean order several MeV peak energies 30?40?MeV. The appears more skewed towards low than expected avalanche theory. pitch angle fairly directed (????0.2) at high isotropic lower (??100?keV). Collisional dissipation current has been studied by massive gas injection different impurities into beams; equilibrium assimilation these injected reasonably described radial pressure balance between ions. following impurity is theory?this anomalous may linked enhanced diffusion caused significant quantity high-Z (typically argon) plasma. final loss wall studied: it was found conversion magnetic kinetic small for times smaller background plasma decay time 1?2?ms.