{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e136ef3bd3c4f2bdb2016122364aa7af891a01c49566c9ce5484dcde115eecd9","created":"2026-10-03T07:18:08Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"834fb5ea1d743f1013cc312e5b5d973fc8b08782e2fc26dae041e7c2189c9eec","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"plasma.wakefield-accelerators.positron-acceleration","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"The usual plasma wake focuses electrons but pushes positrons apart, so positrons cannot be accelerated in it with good quality. A collider needs both, and no scheme yet works for positrons in experiment.","posed_since":"","precise":"In the nonlinear blowout regime, plasma electrons are expelled and the ion column focuses electrons but defocuses positrons. Find a wake configuration (hollow channel, finite-radius plasma, electron filament, magnetized wake, quasi-linear wake) that simultaneously gives gradient above $1e7\\,\\mathrm{eV}/\\mathrm{cm}$, energy-transfer efficiency above 30 percent, rms energy spread below 1 percent and collider-level emittance preservation. An answer is a demonstrated configuration or a proof that the requirements are incompatible.","problem_ref":null,"references":"","settled_by":"An experiment accelerating a positron bunch meeting all four metrics simultaneously.","status_note":"Several schemes meet subsets of the requirements in simulation (2023-2026, e.g. magnetized wakes, arXiv:2608.30455); none meets all in experiment.","title":"Collider-quality positron acceleration in plasma","topic_ref":"df8d7bd34712d11229b506f6cb66d5f2fe29db346946d9557ff6744f777eb91a"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"842e603e2ddfeb3801fabf67b8c8a62ec713923dcbcf5a4719d5e554651e032c","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"1c93e9b7e9d8c49d84e829f6edee371707a6af415c3bc87edfca60aec13ff768","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"_V5Ds5eipajGzThuJVBOvx4LGszkJThkI16OefmW9nfAHNu5KLtA6iGHtY7xeyfBUfThrTog8E_StKm-BRJ4Cw"},"schema":"pubphys.envelope/1"},"record_hash":"842e603e2ddfeb3801fabf67b8c8a62ec713923dcbcf5a4719d5e554651e032c","leaf_index":1884}