{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"fa440eb816f4c2a6a3cb384d2294fc8d6612d29766f57255c5ecb156f8d57e27","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b","fb6f4553695fff0c193bb5aa790c54f1cd4abad56252dd717aa728e7e9702300"],"salt":"6f4bf84de627d433dfb24556bfe8c7c79cae35bca78dbb0284151bec510858c3","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":"2","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":"fb6f4553695fff0c193bb5aa790c54f1cd4abad56252dd717aa728e7e9702300","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":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"5f36b75525f7f436526474baaefb319bfa5c67476040596bed2c440da3b28071","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"6bf5955af4ba63dc4c36041f3a60f9fe342cc1380284779a2dbb93939be418ab","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"EUGvi8YJaIbjP8PP7xI6IQTOkJkXPH6-yqQdZJQZGQEAIGlvBMHLl8qGeQaeiTXgtuL-Ba3dHRpWRiLpehP3Dg"},"schema":"pubphys.envelope/1"},"record_hash":"5f36b75525f7f436526474baaefb319bfa5c67476040596bed2c440da3b28071","leaf_index":2528}