{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"2861151567aa5ae107f3c73bf57f459539413c38116cb28753ae803180cb7dd9","created":"2026-10-03T07:17:50Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"946d748cbb15b720ed0f0992834a6cdaa0c5b52720889f1788f76af0cf34f0a1","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"beams.srf-cavities","field":"beams","n":"1","review_cite":"A. Gurevich, Theory of RF superconductivity for resonant cavities, Superconductor Science and Technology, 2017","review_link":"https://doi.org/10.1088/1361-6668/30/3/034004","review_verified":"true","summary":"Superconducting niobium cavities accelerate particles while wasting almost no energy, but they quench or lose energy at fields below what theory allows. How the losses grow or shrink with field is only partly understood.","title":"Field and loss limits of superconducting RF cavities","topic_ref":null,"why":"Cavity gradient and quality factor set the cost and energy reach of linacs for x-ray FELs, colliders and neutron sources."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"e80fdf5b356ba02d4b3990f8abe874d0448c454195c990a76c551f83781fb3d8","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"1de8db7239578b12b01396aa2cb0766cd3d7f5f8f547e19ad10039ed977fe20a","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"lRRIQ1_q6qFdYSMs293FbrChRG8_HpWGtgYA7YWTzxk85gAo_skI_rFU8vB5I5laQcEseLouB9GGA7bxovz4Cw"},"schema":"pubphys.envelope/1"},"record_hash":"e80fdf5b356ba02d4b3990f8abe874d0448c454195c990a76c551f83781fb3d8","leaf_index":76}