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The potential formation of multi-mega-ampere beams of relativistic "runaway"electrons (REs) during sudden terminations of tokamak plasmas poses asignificant challenge to the tokamak's development as a fusion energy source.Here, we use state-of-the-art modeling of disruption magnetohydrodynamicscoupled with a self-consistent evolution of RE generation and transport to showthat a non-axisymmetric in-vessel coil will passively prevent RE beam formationduring disruptions in the SPARC tokamak, a compact, high-field, high-currentdevice capable of achieving a fusion gain Q > 2 in deuterium-tritium plasmas.

Modeling the complete prevention of disruption-generated runaway electron beam formation with a passive 3D coil in SPARC