{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"d93e4d747c25b4bc76d7e5be9c79974a53ae81a072341cfefb7a6d59ec6ca381","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b","edd05eba805ee01a082485741200b7957dacc14c22a98bcf786638e9ece99f96"],"salt":"d72a0a4740eadd17479445dde5b8e99aad67f086417ea94b3121ed0202d6b5c9","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":"2","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 $\\mathrm{D_2}$ 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":"edd05eba805ee01a082485741200b7957dacc14c22a98bcf786638e9ece99f96","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":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"77062251027aca2450ffdcec017a7438066046d5484db3efeeb81b0ac07facc3","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"d9a492f5c255fcce86ed8d492db378abcda6ed11769796df699cf8126e76b4de","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"xHiJvVK24NzMn8hc_rnDxCsCgUIRoVVWEya4_0KV4-SWUiFy78hSaoMHvwWJqHtBQEN4y9ENN5s-VsM4gW38Cg"},"schema":"pubphys.envelope/1"},"record_hash":"77062251027aca2450ffdcec017a7438066046d5484db3efeeb81b0ac07facc3","leaf_index":3560}