{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"cbaa0aba9a670a82a5f1d8a2172ff980cc6e077506fea9317754fc87bd0995b8","created":"2026-10-03T07:17:56Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"1b2602d92cc502aa4acf5b3105aeb37edfffac840dad9c43ab5edbeb0f44b6d8","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"beams.beam-cooling.mbec-cooling-time","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"An electron-ion collider needs to cool its high-energy proton beam faster than collisions inside the bunch heat it; whether coherent cooling can do this is unsettled.","posed_since":"2013","precise":"For protons at 275 GeV with electron-ion-collider-like emittances and bunch intensities, compute the minimal cooling time of longitudinal and transverse emittance by microbunched electron cooling, including amplifier saturation, electron-beam noise, heating from electron shot noise, and finite overlap. State whether $\\tau_{\\mathrm{cool}}$ shorter than the intrabeam-scattering growth time (of order hours) is reachable.","problem_ref":null,"references":"","settled_by":"A 3D simulation with real particle numbers and validated amplifier models that gives $\\tau_{\\mathrm{cool}}$ and its heating budget.","status_note":"","title":"Cooling time reachable for 275 GeV protons by microbunched electron cooling","topic_ref":"e4bb53556b8c7d13b4b819a20298552b24074d3ba33b0f60982a9bfdd1aa5461"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"00d244d30219de1227374b0c2a1980560b0d86c53f8efc351ae753cbb9a42a50","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"f2ee412a506809b5e8890abfd72106cfe1a4fd3191d3246b4697ad043c09a296","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"-td88L7bTvJ102W7MaJiOKPeasEQ3SPLwJPxC9a7u4vm4I2WE3aUeByAe7JaR0efT_pLhWSaofOKo_YpbcEDAA"},"schema":"pubphys.envelope/1"},"record_hash":"00d244d30219de1227374b0c2a1980560b0d86c53f8efc351ae753cbb9a42a50","leaf_index":651}