{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"bf41eec85f5cf71040b7880e20527f8bb25a229eb56517994dc62212d75c0c28","created":"2026-10-03T07:17:56Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"8ae6fc427ff6c1615f9e2f6fba16f57f94372d4a460593d804dac2f8c357b118","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"beams.space-charge-halo.electron-lens-compensation","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"A low-energy electron beam overlapping the proton beam can partly cancel the protons' mutual repulsion; whether this raises the usable intensity in practice is unknown.","posed_since":"","precise":"An electron lens with charge density matched to the hadron beam cancels part of the space-charge defocusing at its location. Determine whether $N_{e}$ lenses distributed around a ring raise the tolerable intensity by a factor above 1.5 at fixed loss, accounting for breaking of lattice periodicity by finite $N_{e}$, coherent electron-proton instabilities, and lens current noise, with proton tests at the Fermilab IOTA ring as the reference case.","problem_ref":null,"references":"","settled_by":"A ring experiment showing increased intensity at fixed loss with lenses on versus off, consistent with simulation.","status_note":"","title":"Can electron lenses compensate space charge in hadron rings","topic_ref":"416111fd7e6fee07d8da591a9ff1426619f087a5ba70068946ba198ef0a5a6c3"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"fb6f4553695fff0c193bb5aa790c54f1cd4abad56252dd717aa728e7e9702300","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"46d7a8d8294ca2aa016408e40d9df819054524dc58f8cc7bd8895a74b454b366","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"Aq-bdWeVOhLwcutT1NqnyPKFNysEUb8BSJyfmbw10phonMQHJ-gbE-hnfm_8Cm4mI7_Saymf7l4tu5j0DAIsDA"},"schema":"pubphys.envelope/1"},"record_hash":"fb6f4553695fff0c193bb5aa790c54f1cd4abad56252dd717aa728e7e9702300","leaf_index":699}