{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"2cd73d9922100b0cd5c44f5bf338b65f17d4dfb66b7e9d04fe468db449ae650b","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b","e261a67ea5c86207f8fd6d6ef8f88524045813bbfb70caf8512930ce4a28c248"],"salt":"45fa54df0e35cca1df5d5972d117ad8f8606c4b4763f6a9367ee89a0ab0a92e5","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"beams.muon-ionization-cooling.collective-effects","kind":"well-posed","literature_status":"open","n":"2","parents":[],"plain":"Collider muon bunches carry trillions of particles, and their own fields and the charged gas they create inside absorbers may disturb cooling. How large these effects are is uncertain.","posed_since":"","precise":"For bunches of $N \\sim 4 \\times 10^{12}$ muons passing low-$Z$ absorbers (LiH, liquid $\\mathrm{H_2}$, $\\mathrm{H_2}$ gas) in a 6D cooling lattice, quantify emittance growth from space charge, wakefields and the ionization plasma created in the absorber, and determine whether they limit cooling at the design intensity.","problem_ref":"e261a67ea5c86207f8fd6d6ef8f88524045813bbfb70caf8512930ce4a28c248","references":"","settled_by":"Self-consistent beam-plasma simulations of the full cooling lattice at design intensity, benchmarked with an intense-beam absorber experiment.","status_note":"","title":"Collective effects of intense muon bunches in cooling absorbers","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"3f462275dbdd10e3515501cb2eeeb8c4f2aedfd1267bdc2f217551a06d9b447f","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"b730e0f1bdab93ad6a18ada734e59f9fe975a04e84a0f6a0424c2209e52e6c38","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"bUj_J-V1oKQA64apE6pE_uNU1VJy-ohZDgi8ubop7NdFKSnLkyGaf-DDoiZq-p0s2r1eKW24LaSwl2anmergAw"},"schema":"pubphys.envelope/1"},"record_hash":"3f462275dbdd10e3515501cb2eeeb8c4f2aedfd1267bdc2f217551a06d9b447f","leaf_index":2488}