{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"1e220b9c510e9d02b31b327b0030aa3decb2acfa7ac6f0055f808413db074970","created":"2026-10-03T07:17:50Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"3737d04cf3a0685479efc1114e00b90313a0b519a49dd23d67f0d5a467e81521","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"beams.srf-q-slope","field":"beams","n":"1","review_cite":"G. Ciovati, G. Myneni, F. Stevie, P. Maheshwari, D. Griffis, High field Q slope and the baking effect: Review of recent experimental results and new data on Nb heat treatments, Physical Review Special Topics - Accelerators and Beams, 2010","review_link":"https://doi.org/10.1103/PhysRevSTAB.13.022002","review_verified":"true","summary":"Superconducting niobium cavities lose almost no energy, but at strong fields the losses suddenly grow (the Q-slope), while cavities treated with nitrogen lose less as the field grows (the anti-Q-slope). Why either happens is still debated.","title":"High-field Q-slope and anti-Q-slope in niobium","topic_ref":null,"why":"The quality factor at operating field sets the cryogenic cost of every superconducting linac, including XFELs and future colliders."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"07f4b938cd1bb3f7a5e87f7eeb09fc5d6d7083a2a323fd1976ce3e976aa2af82","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"e14fc16fd3e85d9f273107de28a69b5eb3767dffd1b016afe752535b5d168424","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"QGJ5EQq9-n1AHPUcrAJKVQUoHo_cpKgwbPJkZmfForHOHuDPLTiTBJWRTK_UaI4WNAaNaMZI7cLk-zqfR6lEAA"},"schema":"pubphys.envelope/1"},"record_hash":"07f4b938cd1bb3f7a5e87f7eeb09fc5d6d7083a2a323fd1976ce3e976aa2af82","leaf_index":77}