{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a7223606214e5842d5bf7c07b7067dd7b947f7d691fa54ca6f622a9d7581d75a","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["88c0f288c94255c019a5c58e3e4f11501020732da95b5e25a81c4d1a10852abe","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"95be3ee83835467b07847d84973014d57b60a82e52d1ed034617268c2617c066","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"beams.beam-cooling.osc-high-energy","kind":"well-posed","literature_status":"open","n":"2","parents":[],"plain":"Optical stochastic cooling, first shown with electrons in a small ring, uses light pulses emitted by each particle to correct that particle's motion; it is unproven for heavy high-energy beams.","posed_since":"1993","precise":"Optical stochastic cooling was demonstrated with $100\\,\\mathrm{MeV}$ electrons at the Fermilab IOTA ring (published 2022) using undulator light at $\\sim 10^{-4}\\,\\mathrm{cm}$ wavelength without optical amplification. Determine whether OSC with optical amplification can cool protons at $100\\,\\mathrm{GeV} \\text{ to } 7\\,\\mathrm{TeV}$ with damping time shorter than the intrabeam-scattering time, given undulator radiation per proton, amplifier gain and bandwidth, and path-length stability of $\\sim 0.1$ wavelength.","problem_ref":"88c0f288c94255c019a5c58e3e4f11501020732da95b5e25a81c4d1a10852abe","references":"","settled_by":"A design calculation with realistic amplifier and lattice parameters giving the damping time, followed by a demonstration with hadrons.","status_note":"","title":"Optical stochastic cooling of hadron beams at collider energies","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"79684b6efaef7dac67d5fbe93e1d247176c7f0cda82b98b75fa842e4a62b831c","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"8fcd9dd5d77acd26773887a3645b6e9df438d76e8485201bb4a87a8cc9cc2714","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"cx2qfBMiWhCY3tXwj1j77lbJRGxN5LngMt75Mzv-f570esNFnHil1MQhYm4oBYOCR8dYlnHo5DVyFaHU-S3pBA"},"schema":"pubphys.envelope/1"},"record_hash":"79684b6efaef7dac67d5fbe93e1d247176c7f0cda82b98b75fa842e4a62b831c","leaf_index":2464}