{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"47506ed89ead025a25b4c503c289254e5709b36bce25e725246c4a17c17868d0","created":"2026-10-03T07:17:56Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","91628ed177e96e50cb4b1e908fdd7876ed07b1198939d8e060097f0b18dd5c67"],"salt":"cb0410ebced3fe5fbe868782c690ac5c8923596f0c8eea4819876bab11ecaafa","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"beams.srf-q-slope.low-temp-bake","kind":"phenomenon","literature_status":"contested","n":"1","parents":[{"note":"Baking cure is the bake-dependence part of the high-field Q-slope problem","parent_revision":"91628ed177e96e50cb4b1e908fdd7876ed07b1198939d8e060097f0b18dd5c67","relation":"special_case"}],"plain":"Heating a niobium cavity at about 120 degrees Celsius for two days removes the high-field loss rise. What this mild bake changes in the metal is not fully known.","posed_since":"","precise":"A 120 C bake of 24 to 48 h in vacuum eliminates the high-field Q-slope in electropolished Nb. Determine which change in the near-surface region (oxygen diffusion from the native oxide, suppression of hydride nucleation by vacancy-hydrogen complexes, or change in mean free path) is necessary and sufficient, and predict the required bake time and temperature.","problem_ref":null,"references":"","settled_by":"Depth-resolved composition and defect measurements on samples baked in parallel with cavities, reproducing the cure and its absence for varied bake parameters.","status_note":"","title":"Why low-temperature baking at about 120 C removes the Q-slope","topic_ref":"07f4b938cd1bb3f7a5e87f7eeb09fc5d6d7083a2a323fd1976ce3e976aa2af82"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"4b4616b4787c684e096273df7a7ac1561c788752226240e5cd33606537b2c0f9","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"3c3b4eaf954c2677dcaae35be5defd3febfc731ded5176f0959588d1a0f8119e","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"7WyfWmNXAAS6ck3LIC0bXaulq2t99AldOlAwbnQIfBndPxGzpNjuWEh8WPHNZq4dO4F_jCt-tdGMOa_bNfzdDA"},"schema":"pubphys.envelope/1"},"record_hash":"4b4616b4787c684e096273df7a7ac1561c788752226240e5cd33606537b2c0f9","leaf_index":710}