{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a971003200ed38ed5c0aa06663469659c8547c99d7e3e936a53eae2837b3743c","created":"2026-10-03T07:18:08Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"41dba856c9e58d7578df654c7434ffff83fa47c0fca663b558bab120ac6c6236","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"plasma.burning-plasma.burn-stability","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"When most heating comes from fusion itself, a small temperature rise can raise fusion power and heat the plasma further. Whether a reactor plasma stays steady and can be steered with available controls has not been tested.","posed_since":"","precise":"With alpha heating $P_\\alpha$ proportional to $n^2 \\langle\\sigma v\\rangle(T)$ and confinement degrading with power, determine whether high-gain ($Q$ of 10 or more) or ignited tokamak operating points are thermally stable and controllable with realistic actuators (fueling, auxiliary heating, impurity seeding), including profile self-organization and coupling to pedestal and density limits. An answer is the stable, controllable operating region from a validated integrated model.","problem_ref":null,"references":"","settled_by":"Integrated core-edge burning-plasma simulations validated in ITER D-T operation.","status_note":"","title":"Thermal stability and control of a self-heated tokamak plasma","topic_ref":"b2068d5f1bac3966c9cee581f56630c3c4fcfd678ae16ee7f5ea4ea28a182b60"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"4bab2fe060362f9108b623fb69ad146d777d9f59d0270868c3522214823cf56e","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"cc2c6cc70467b741680db28fb9e0e35e08dd2381e8f3fd7b68ce76dfd306eb43","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"iig6dpW6YumQnGi24C8SeBP_pyP5aihkQVYe4hTXW9QTQUCMcomf5Ng8FKlB8OGLCW8CJ7s78e34whyCJ2TmBQ"},"schema":"pubphys.envelope/1"},"record_hash":"4bab2fe060362f9108b623fb69ad146d777d9f59d0270868c3522214823cf56e","leaf_index":1819}