{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"8c841f3fe40890f04c07e852ea2ff70bf839dd47344cef8f1ed067969dd6ccdc","created":"2026-10-03T07:17:56Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"c996f3066df926ddcaebaf65c17ccd6a82dc7d9b4e21fed7dc6e74d7a7f16a16","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"beams.beam-cooling.muon-6d-final-cooling","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Muons must be squeezed in phase space by a factor of about a million within microseconds, by passing them through absorbers and re-accelerating them; the full chain has never been built.","posed_since":"","precise":"Transverse ionization cooling of muons through a single absorber was demonstrated by MICE (published 2020). Determine whether a realistic 6D cooling channel plus final cooling stage can reach normalized transverse emittance of approximately 2.5e-3 cm and longitudinal emittance of approximately $7\\,\\mathrm{cm}$ with overall muon transmission above $\\sim 10$ percent, including RF limits in solenoid fields, absorber heating, space charge and muon decay.","problem_ref":null,"references":"","settled_by":"An end-to-end simulation with engineering-feasible fields and gradients reaching both emittances, confirmed by a 6D cooling demonstrator for the first stages.","status_note":"","title":"Reaching muon collider target emittances by ionization 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