{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f23df8b9ab12291fcb65437727c73d051d950eeb511fa588a2b6ae0e36b53c72","created":"2026-10-03T07:17:56Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"7ccbcf49fd02ffd7e51e43fb0bdbbbeec72a22ba03db522631bee623ca524e6f","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"beams.muon-ionization-cooling.6d-demonstration","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"An earlier experiment showed muons can be cooled sideways by one absorber, but not in all directions and not over many repeated stages. A full demonstration is still needed.","posed_since":"","precise":"MICE demonstrated transverse (4D) emittance reduction through a single absorber without RF re-acceleration. Demonstrate net 6D emittance reduction over several cells with RF, including emittance exchange via wedges or dispersion, and measured agreement with simulation at the percent level.","problem_ref":null,"references":"","settled_by":"A cooling demonstrator measuring muon-by-muon 6D emittance before and after a multi-cell channel with RF.","status_note":"","title":"Experimental demonstration of 6D cooling with re-acceleration","topic_ref":"cf06ea9df973fe3a057c03ab62554e74eaac4ddf41416780bfff92f0d24ef951"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"85f35b1ea75a7596a7e2d8219dd5f2a652bba348aacba32f5a6984190796d1e2","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"01eee60a1e2f58746f25ca52e84068c0624933aa5a79609caa6410919eb251d3","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"o2GL41y6J3TqBsbls_um0pW_n1AbBaYS6O1OTXX9dGHO5IeaXq7TReXYnYMiqEZ3bf6Fk0U5BPemLfnyfsA2Dg"},"schema":"pubphys.envelope/1"},"record_hash":"85f35b1ea75a7596a7e2d8219dd5f2a652bba348aacba32f5a6984190796d1e2","leaf_index":673}