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Whether this works at ITER's much larger beam energy is unknown.","posed_since":"","precise":"In JET, DIII-D and TCV, low-$Z$ (D2) injection into a runaway plateau purges high-$Z$ impurities, lowers resistivity and triggers a large MHD instability that deposits the beam energy over a wide wetted area with little avalanche regeneration. Determine whether this benign termination survives at ITER beam current and energy, where regeneration and the instability's wetted area differ. An answer is yes or no for the ITER reference runaway plateau, with the predicted peak wall energy deposition.","problem_ref":null,"references":"","settled_by":"3D MHD-kinetic simulations validated on JET and DIII-D benign terminations, applied to ITER parameters.","status_note":"Benign termination was demonstrated on JET, DIII-D and TCV in 2021-2024; a 2024 model found an upper neutral-pressure limit for it (arXiv:2412.14721).","title":"Scaling of benign runaway beam termination to 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