{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e24fca35185dfb15cf7fc2c5952fbc2c0987be8d986a68b08e33e461bb2c051f","created":"2026-10-03T07:17:56Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"6004f3aebf9ce142adff44ca72eaa02b5ead5693331443ae580563b92d7247a0","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":"1","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 $N \\sim 4e12$ muons passing low-$Z$ absorbers (LiH, liquid H2, H2 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":null,"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":"cf06ea9df973fe3a057c03ab62554e74eaac4ddf41416780bfff92f0d24ef951"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"e261a67ea5c86207f8fd6d6ef8f88524045813bbfb70caf8512930ce4a28c248","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"3776c1a6cf8783e90fbc87eedde73ac71a7225406a7071951b5ed71de275402b","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"f8ymDbRdncOxbSf92Fr-LGlhpeL9tlWQI135Xopzlhw-vI9zR1XPA4Sg9hXkpWhMnmcOzHURp1S74S1cE6r0AA"},"schema":"pubphys.envelope/1"},"record_hash":"e261a67ea5c86207f8fd6d6ef8f88524045813bbfb70caf8512930ce4a28c248","leaf_index":674}