{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"125d6a11adc58908c699f50ed954cb55d174038ceda9d4bb8cedb8f03872b6ba","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["842e603e2ddfeb3801fabf67b8c8a62ec713923dcbcf5a4719d5e554651e032c","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"606d9d9d7b5159c4f4d788b3735bbfad77e57acb129dfe512b7c54e4171cf601","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":"2","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 $10^{7}\\,\\mathrm{eV}/\\mathrm{cm}$, 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":"842e603e2ddfeb3801fabf67b8c8a62ec713923dcbcf5a4719d5e554651e032c","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":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"297a27c6bbbf8b7a9ec96d797d3092b9ab3ef08a1859a9aa2a07b250ccdcd3f4","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"af5dd24795be35193dccb7be550244bbed0d9ccf668c80297fda1b9c783b21d3","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"bMQNQUfZ9Pl7mnuBQOnO2iDQlZMTZSBrYQ24wrKEHshv4RcWsRC7jWMBiQJxgyyIoGcOXE1EkfSkTDnmUfFsDg"},"schema":"pubphys.envelope/1"},"record_hash":"297a27c6bbbf8b7a9ec96d797d3092b9ab3ef08a1859a9aa2a07b250ccdcd3f4","leaf_index":3622}