{"paper":{"title":"Production of Intense Spin-Polarized Beams of Hydrogen Isotopes by Charge Transfer with High Density Raman-Pumped Alkali-Metal Vapors","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"Multi-ampere spin-polarized hydrogen isotope beams can be produced by charge transfer in Raman-pumped cesium vapor.","cross_cats":["nucl-ex","physics.plasm-ph"],"primary_cat":"physics.atom-ph","authors_text":"Cary B. Forest, Deniz D. Yavuz, Thad G. Walker","submitted_at":"2026-05-15T22:01:28Z","abstract_excerpt":"It should be possible to generate multi-ampere spin-polarized beams of hydrogen isotopes by repeated charge-transfer collisions in highly spin-polarized Cs vapor. Estimates suggest that off-resonant Raman pumping with kW scale narrowband tunable light at 895 nm should be able to produce a 1 m long, 10 cm diameter volume of 80\\% polarized Cs vapor. The charge transfer collisions between the Cs and hydrogen result in a high nuclear spin-polarized negative ion beam that can be subsequently accelerated to high energy, neutralized, and be used to heat fusion plasmas with resulting increases in the "},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"It should be possible to generate multi-ampere spin-polarized beams of hydrogen isotopes by repeated charge-transfer collisions in highly spin-polarized Cs vapor.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"Off-resonant Raman pumping with kW scale narrowband tunable light at 895 nm should be able to produce a 1 m long, 10 cm diameter volume of 80% polarized Cs vapor.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Estimates indicate that kW-scale Raman pumping at 895 nm can produce 80% polarized Cs vapor for charge-transfer generation of intense nuclear spin-polarized H isotope negative ion beams suitable for fusion applications.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"Multi-ampere spin-polarized hydrogen isotope beams can be produced by charge transfer in Raman-pumped cesium vapor.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"158b66373a75515cb1f99435b5287f8361e27b03fe9eb0f90139772ba33e865f"},"source":{"id":"2605.16663","kind":"arxiv","version":1},"verdict":{"id":"659e4493-84e9-4969-bd1a-628a4672f1b4","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-19T20:59:44.797821Z","strongest_claim":"It should be possible to generate multi-ampere spin-polarized beams of hydrogen isotopes by repeated charge-transfer collisions in highly spin-polarized Cs vapor.","one_line_summary":"Estimates indicate that kW-scale Raman pumping at 895 nm can produce 80% polarized Cs vapor for charge-transfer generation of intense nuclear spin-polarized H isotope negative ion beams suitable for fusion applications.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"Off-resonant Raman pumping with kW scale narrowband tunable light at 895 nm should be able to produce a 1 m long, 10 cm diameter volume of 80% polarized Cs vapor.","pith_extraction_headline":"Multi-ampere spin-polarized hydrogen isotope beams can be produced by charge transfer in Raman-pumped cesium vapor."},"integrity":{"clean":false,"summary":{"advisory":1,"critical":0,"by_detector":{"doi_compliance":{"total":1,"advisory":1,"critical":0,"informational":0}},"informational":0},"endpoint":"/pith/2605.16663/integrity.json","findings":[{"note":"DOI in the printed bibliography is fragmented by whitespace or line breaks. A longer candidate (10.1103/Phys-RevA.75.023401) was visible in the surrounding text but could not be confirmed against doi.org as printed.","detector":"doi_compliance","severity":"advisory","ref_index":7,"audited_at":"2026-05-19T21:11:50.097121Z","detected_doi":"10.1103/Phys-RevA.75.023401","finding_type":"recoverable_identifier","verdict_class":"incontrovertible","detected_arxiv_id":null}],"available":true,"detectors_run":[{"name":"doi_title_agreement","ran_at":"2026-05-19T21:31:19.397787Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-19T21:11:50.097121Z","status":"completed","version":"1.0.0","findings_count":1},{"name":"claim_evidence","ran_at":"2026-05-19T19:01:56.396255Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"ai_meta_artifact","ran_at":"2026-05-19T18:33:26.516036Z","status":"skipped","version":"1.0.0","findings_count":0}],"snapshot_sha256":"47604cde5a5ffd56bd7e0f9851df2ffb4bed59202f29d66c0d22bd79925810cd"},"references":{"count":20,"sample":[{"doi":"","year":1982,"title":"R. M. Kulsrud, H. P. Furth, E. J. Valeo, P. Plasnza, N. Jersey, and M. Goldhaber, Fusion Reactor Plasmas with Polarized Nuclei, Phys. Rev. Lett.49, 1248 (1982)","work_id":"143f2ff0-86e5-46ad-b6b4-e88fe50fcab3","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"10.3389/fphy.2024.1355212","year":2024,"title":"W. W. Heidbrink, L. R. Baylor, M. B¨ uscher, R. W. En- gels, A. V. Garcia, A. G. Ghiozzi, G. W. Miller, A. M. Sandorfi, X. Wei, and X. Zheng, A research program to measure the lifetime of spin polariz","work_id":"35475ec7-c792-40df-b68f-ae580818c6bb","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1986,"title":"R. Kulsrud, E. Valeo, and S. Cowley, Physics of spin- polarized plasmas, Nuclear Fusion26, 1443 (1986)","work_id":"fa4d74bd-29bb-47fe-8198-ac22230b52e2","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":null,"title":"Zelenski, Polarized Ion Sources, inParticle Acceler- ation and Detection, Vol","work_id":"da9452c1-8d2e-439a-8257-1ae4b5916d4a","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1967,"title":"P. G. Sona, A new method proposed to increase polar- ization in polarized ion sources of H- and D-, Energia Nucleare14, 295–299, (1967)","work_id":"1a6cab84-6e5d-4d24-a1ec-c74f1dad882f","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":20,"snapshot_sha256":"125b6cb8d46ed9d9ddf56720381ea5b8ed479e21d25015a344074be57c90d74d","internal_anchors":0},"formal_canon":{"evidence_count":2,"snapshot_sha256":"627efda766d565b3b0a4642b88fa58b616dff52ca97bcc3982fe688d7a893b4d"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}