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Computational assessment reveals severe runaway-electron avalanches and high halo currents in a compact spherical-tokamak breeder, highlighting the need for rapid shattered-pellet mitigation.
A reduced-order assessment of disruptions, runaway electrons, and electromagnetic loads for the compact spherical-tokamak breeder, on a NIMROD-verified equilibrium. Current-quench time 7-19 ms; a SEVERE runaway-electron avalanche (E/E_c about 1128, a beam of order 70 percent of plasma current); halo current 35 percent of plasma current. The conclusion is a hard design requirement: shattered-pellet-class disruption mitigation triggered within the current-quench window. The disruption risk is not claimed negligible.
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Ford et al. (2026) studied this question.
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