{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"e126cb078fc2bec934c0f0c1d389f6afad924aa724a99fa7cd215a32a593b035","created":"2026-10-03T07:17:50Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"4d70845683e1d679b3c3f7240f0c4ffcad25a4bd2e625eaa56eede567c455244","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"beams.fel-physics","field":"beams","n":"1","review_cite":"C. Pellegrini, A. Marinelli, S. Reiche, The physics of x-ray free-electron lasers, Reviews of Modern Physics, 2016","review_link":"https://doi.org/10.1103/RevModPhys.88.015006","review_verified":"true","summary":"A free-electron laser makes x-rays by sending a bright electron beam through a row of alternating magnets, where the electrons gather into thin slices and radiate in step. How short a wavelength, how narrow a spectrum and how quiet a beam can be reached are open.","title":"Coherence and wavelength limits of free-electron lasers","topic_ref":null,"why":"X-ray FELs are the brightest x-ray sources, and their limits set what structural biology, chemistry and materials science can image."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"62fcdc9c8f916869de7ec88dba711f39f0c92f912f69f270978376119dc0bcaa","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"32f07048d83f1777cc890f09c330cfca0123fecd31251d1ffde32ee058627a12","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"iwdanfllU5lkyHd1k8yamezGtDmAVi6A0sP-FAz-pWUl8MD0Nnt2HtYDIfiav8kaq31HCF9Slm1DIAjvvOALCA"},"schema":"pubphys.envelope/1"},"record_hash":"62fcdc9c8f916869de7ec88dba711f39f0c92f912f69f270978376119dc0bcaa","leaf_index":66}