Disruption mitigation with high-pressure noble gas injection

摘要: Abstract High-pressure gas jets of neon and argon are used to mitigate the three principal damaging effects tokamak disruptions: thermal loading divertor surfaces, vessel stress from poloidal halo currents buildup loss relativistic electrons wall. The jet penetrates as a neutral species through central plasma at its sonic velocity. injected atoms increase up 500 times total electron inventory in volume, resulting relatively benign radiative dissipation >95% stored energy. rapid cooling slow movement wall reduce during current decay. thermally collapsed is very cold (∼1–2 eV) impurity charge distribution can include >50% fraction species. If sufficient quantity injected, neutrals inhibit runaway electrons. A physical model developed validated against DIII-D experiments. shows that mitigation, including suppression, extrapolates favorably burning plasmas where disruption damage will be more severe. Initial results real-time detection triggering injection for mitigation shown.