{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f08b856ab6dcb6d29520cbb85415970900335a50be81f354e1f5dee549209ac7","created":"2026-10-03T07:18:08Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"04f3def1ef4d873f5db901c9a4699bd7f4255a421766071d90e86907add8df7f","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"plasma.disruptions.runaway-current-iter","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"ITER plans to shoot frozen pellets of deuterium and neon into a disrupting plasma to radiate its energy safely. Whether this also prevents a dangerous runaway electron beam, which grows by an avalanche of knock-on collisions, is uncertain.","posed_since":"","precise":"In ITER disruptions mitigated by shattered pellet injection (SPI, fragmented D2 and Ne pellets), a small runaway seed from hot-tail generation, tritium beta decay and Compton scattering of gamma rays from the activated wall is amplified by avalanche multiplication. Compute the final runaway current versus injected D and Ne quantities, including losses through stochastic magnetic fields during the thermal quench and runaway-driven kinetic instabilities, and determine whether any injection scheme keeps the runaway current below the wall-tolerable level.","problem_ref":null,"references":"","settled_by":"Validated 3D MHD plus kinetic runaway modeling of ITER SPI scenarios, confirmed by ITER commissioning disruptions.","status_note":"2026 modeling with improved physics (arXiv:2602.22177) finds most D-T H-mode SPI scenarios exceed tolerable runaway currents but identifies one theoretically viable D-T scheme; no experiment reaches ITER-scale avalanche gain.","title":"Runaway electron current after mitigated disruptions in ITER","topic_ref":"ea2728865d1aa024b91c5a88f675b822fd929225af4da0f04e206330d21409ab"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"edd05eba805ee01a082485741200b7957dacc14c22a98bcf786638e9ece99f96","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"1a97a09138ef9e687a84fe0ec76002ac02fe24db32a5697bb4809498740d1645","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"Gel-j3A6sNIY0gWr1tofvu1Q49WuLst9qSXM0t1y6zkm43MKWTlrZ8jeIgqfNHO3u_XyifMb-bFLaWNNkbEnAQ"},"schema":"pubphys.envelope/1"},"record_hash":"edd05eba805ee01a082485741200b7957dacc14c22a98bcf786638e9ece99f96","leaf_index":1829}