{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"241b0652ec9df0cca1669198e8712a4ff78ed7d0ca360786e45343d8e32de6be","created":"2026-10-03T07:17:56Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"7e2ae886f13546c66c8dbb828e1568deb1bde9b0fb55c408a209c1eba7637380","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"beams.beam-cooling.coherent-electron-cooling","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"In coherent electron cooling each ion imprints a density ripple on a co-moving electron beam, the ripple is amplified, and it then pushes the ion back toward the ideal energy; this has not yet been seen to cool a beam.","posed_since":"2009","precise":"In coherent electron cooling (CeC) or its microbunched variant (MBEC), hadrons modulate the density of a co-moving electron beam, the modulation is amplified (FEL or plasma-cascade amplifier) and its field acts back on the same hadrons. Determine experimentally whether such a section produces a measurable reduction of hadron energy spread or emittance, with a cooling rate within a factor 2 of theory.","problem_ref":null,"references":"","settled_by":"A measured reduction of hadron bunch length, energy spread or emittance that switches off when the electron beam or amplifier is detuned.","status_note":"Proof-of-principle work at the BNL RHIC ring reported amplifier, beam-dynamics and diagnostic results; conference and journal records checked through mid-2026 report no observed cooling of hadrons.","title":"Experimental demonstration of coherent electron cooling of hadrons","topic_ref":"e4bb53556b8c7d13b4b819a20298552b24074d3ba33b0f60982a9bfdd1aa5461"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"47e78bd83dd8ff4f315979686e0479747d951ebb0bfdacffad4e84cd1ac809db","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"45c2a3d343fc8418050ade402b1cbad64d719cf9329b01829ca3a8c009a85538","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"Ih4WLMT4nagLMztgQUZwDun1l5BjJQ4qAEtYeqyAVKchz8aR73U8HhkBy7MBfWRgdEJLESpuRgori1NIht0EBQ"},"schema":"pubphys.envelope/1"},"record_hash":"47e78bd83dd8ff4f315979686e0479747d951ebb0bfdacffad4e84cd1ac809db","leaf_index":649}