{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"996ba8ae682084c330c31df92e2e49b3fa29cd67d13a06fe2314cc5ea8ea1281","created":"2026-10-03T07:17:56Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"535ccd3de621936c8ff41db45b57c3239c7c37948596fc18fffd3dbe3b73251f","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":"1","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 $\\sim 1e-4\\,\\mathrm{cm}$ 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":null,"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":"e4bb53556b8c7d13b4b819a20298552b24074d3ba33b0f60982a9bfdd1aa5461"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"88c0f288c94255c019a5c58e3e4f11501020732da95b5e25a81c4d1a10852abe","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"15b004d03354169ff32749438139db6efee3d4d33ef980ffdba51a9bc96404f5","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"psKU5lDjndyrF_JJz71lg99xVqrYBD238bUMpW0_BEhEkKShFFTDUETr0lceMmf8yAZmp41qdaD756LhnmL3Cg"},"schema":"pubphys.envelope/1"},"record_hash":"88c0f288c94255c019a5c58e3e4f11501020732da95b5e25a81c4d1a10852abe","leaf_index":653}