{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:FDQQTYLN5UYNME4CFZCSMHI4W7","short_pith_number":"pith:FDQQTYLN","canonical_record":{"source":{"id":"2608.04932","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2026-08-05T14:56:39Z","cross_cats_sorted":[],"title_canon_sha256":"c63494b8ea715796afe4453450559bef2404e7b77ca85930e7642c0d2b9b1e08","abstract_canon_sha256":"d152f91a7fcea85935f16286dc8861fb6c8e584cc0c93580182e2d06d761b83f"},"schema_version":"1.0"},"canonical_sha256":"28e109e16ded30d613822e45261d1cb7da189c7384819b79043ef93fdcbdb1c8","source":{"kind":"arxiv","id":"2608.04932","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.04932","created_at":"2026-08-06T01:47:43Z"},{"alias_kind":"arxiv_version","alias_value":"2608.04932v1","created_at":"2026-08-06T01:47:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.04932","created_at":"2026-08-06T01:47:43Z"},{"alias_kind":"pith_short_12","alias_value":"FDQQTYLN5UYN","created_at":"2026-08-06T01:47:43Z"},{"alias_kind":"pith_short_16","alias_value":"FDQQTYLN5UYNME4C","created_at":"2026-08-06T01:47:43Z"},{"alias_kind":"pith_short_8","alias_value":"FDQQTYLN","created_at":"2026-08-06T01:47:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:FDQQTYLN5UYNME4CFZCSMHI4W7","target":"record","payload":{"canonical_record":{"source":{"id":"2608.04932","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2026-08-05T14:56:39Z","cross_cats_sorted":[],"title_canon_sha256":"c63494b8ea715796afe4453450559bef2404e7b77ca85930e7642c0d2b9b1e08","abstract_canon_sha256":"d152f91a7fcea85935f16286dc8861fb6c8e584cc0c93580182e2d06d761b83f"},"schema_version":"1.0"},"canonical_sha256":"28e109e16ded30d613822e45261d1cb7da189c7384819b79043ef93fdcbdb1c8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-08-06T01:47:43.539488Z","signature_b64":"zydj/Gg5o2v/qqEZIOFSQtIlofTk6sa+mbFlS3Tee+NiFhgoutBV25rqL8+cqAb/t4Lv02pun4rXV/b/ylj2CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"28e109e16ded30d613822e45261d1cb7da189c7384819b79043ef93fdcbdb1c8","last_reissued_at":"2026-08-06T01:47:43.538114Z","signature_status":"signed_v1","first_computed_at":"2026-08-06T01:47:43.538114Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2608.04932","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-08-06T01:47:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NihC9uCnerEH5+yzxwbMOLYLnSOvZ++GJduk9dYpf89X0laQVVi0udJ0kTjyEoxTNjW2Nz2ZXHyjPTxStuZuDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T09:02:33.807909Z"},"content_sha256":"0d13f4989c5180a47d10c9b981fe184de331ae3ab62bb6247e1ba54e81f13eaf","schema_version":"1.0","event_id":"sha256:0d13f4989c5180a47d10c9b981fe184de331ae3ab62bb6247e1ba54e81f13eaf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:FDQQTYLN5UYNME4CFZCSMHI4W7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A plasma photocathode for spin-polarized electron beams using excited hydrogen halides","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.plasm-ph","authors_text":"Alexander Pukhov, Bernhard Hidding, Chinmaya Singh, Dimitris Sofikitis, Lars Reichwein, Liangliang Ji, Markus B\\\"uscher, Thomas C. Wilson, T. Peter Rakitzis","submitted_at":"2026-08-05T14:56:39Z","abstract_excerpt":"Spin-polarized electron beams are essential tools for probing fundamental symmetries and for the search beyond the Standard Model. While plasma-based accelerators are a promising pathway towards higher-energy frontiers, they have so far failed to deliver a competitive polarized source: existing proposals are challenging to realize and achievable polarizations remain far below conventional sources. Here, we introduce a photocathode-like scheme, applied to a gas of pre-polarized hydrogen halides. A VUV and a visible laser pulse excite the halide atoms to create a two-component ionization medium,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.04932","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2608.04932/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-08-06T01:47:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lZXh9n1XEP//NP+LZ7o5Rgr5qA1koQERb9dw/AypYbK07t6XPIBYSRq0EiFFwQYbxV5hJcNMINbFCG+zAl1tCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T09:02:33.808434Z"},"content_sha256":"10ea944c5c8ae59ae656000292fb24165dd34a1db373c28dac99cc3ff54e1585","schema_version":"1.0","event_id":"sha256:10ea944c5c8ae59ae656000292fb24165dd34a1db373c28dac99cc3ff54e1585"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FDQQTYLN5UYNME4CFZCSMHI4W7/bundle.json","state_url":"https://pith.science/pith/FDQQTYLN5UYNME4CFZCSMHI4W7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FDQQTYLN5UYNME4CFZCSMHI4W7/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-08-07T09:02:33Z","links":{"resolver":"https://pith.science/pith/FDQQTYLN5UYNME4CFZCSMHI4W7","bundle":"https://pith.science/pith/FDQQTYLN5UYNME4CFZCSMHI4W7/bundle.json","state":"https://pith.science/pith/FDQQTYLN5UYNME4CFZCSMHI4W7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FDQQTYLN5UYNME4CFZCSMHI4W7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:FDQQTYLN5UYNME4CFZCSMHI4W7","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"d152f91a7fcea85935f16286dc8861fb6c8e584cc0c93580182e2d06d761b83f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2026-08-05T14:56:39Z","title_canon_sha256":"c63494b8ea715796afe4453450559bef2404e7b77ca85930e7642c0d2b9b1e08"},"schema_version":"1.0","source":{"id":"2608.04932","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.04932","created_at":"2026-08-06T01:47:43Z"},{"alias_kind":"arxiv_version","alias_value":"2608.04932v1","created_at":"2026-08-06T01:47:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.04932","created_at":"2026-08-06T01:47:43Z"},{"alias_kind":"pith_short_12","alias_value":"FDQQTYLN5UYN","created_at":"2026-08-06T01:47:43Z"},{"alias_kind":"pith_short_16","alias_value":"FDQQTYLN5UYNME4C","created_at":"2026-08-06T01:47:43Z"},{"alias_kind":"pith_short_8","alias_value":"FDQQTYLN","created_at":"2026-08-06T01:47:43Z"}],"graph_snapshots":[{"event_id":"sha256:10ea944c5c8ae59ae656000292fb24165dd34a1db373c28dac99cc3ff54e1585","target":"graph","created_at":"2026-08-06T01:47:43Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2608.04932/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Spin-polarized electron beams are essential tools for probing fundamental symmetries and for the search beyond the Standard Model. While plasma-based accelerators are a promising pathway towards higher-energy frontiers, they have so far failed to deliver a competitive polarized source: existing proposals are challenging to realize and achievable polarizations remain far below conventional sources. Here, we introduce a photocathode-like scheme, applied to a gas of pre-polarized hydrogen halides. A VUV and a visible laser pulse excite the halide atoms to create a two-component ionization medium,","authors_text":"Alexander Pukhov, Bernhard Hidding, Chinmaya Singh, Dimitris Sofikitis, Lars Reichwein, Liangliang Ji, Markus B\\\"uscher, Thomas C. Wilson, T. Peter Rakitzis","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2026-08-05T14:56:39Z","title":"A plasma photocathode for spin-polarized electron beams using excited hydrogen halides"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.04932","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:0d13f4989c5180a47d10c9b981fe184de331ae3ab62bb6247e1ba54e81f13eaf","target":"record","created_at":"2026-08-06T01:47:43Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"d152f91a7fcea85935f16286dc8861fb6c8e584cc0c93580182e2d06d761b83f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2026-08-05T14:56:39Z","title_canon_sha256":"c63494b8ea715796afe4453450559bef2404e7b77ca85930e7642c0d2b9b1e08"},"schema_version":"1.0","source":{"id":"2608.04932","kind":"arxiv","version":1}},"canonical_sha256":"28e109e16ded30d613822e45261d1cb7da189c7384819b79043ef93fdcbdb1c8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"28e109e16ded30d613822e45261d1cb7da189c7384819b79043ef93fdcbdb1c8","first_computed_at":"2026-08-06T01:47:43.538114Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-08-06T01:47:43.538114Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zydj/Gg5o2v/qqEZIOFSQtIlofTk6sa+mbFlS3Tee+NiFhgoutBV25rqL8+cqAb/t4Lv02pun4rXV/b/ylj2CA==","signature_status":"signed_v1","signed_at":"2026-08-06T01:47:43.539488Z","signed_message":"canonical_sha256_bytes"},"source_id":"2608.04932","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0d13f4989c5180a47d10c9b981fe184de331ae3ab62bb6247e1ba54e81f13eaf","sha256:10ea944c5c8ae59ae656000292fb24165dd34a1db373c28dac99cc3ff54e1585"],"state_sha256":"8834465346a09b96d14471d624b1813f205e63b146ec4dacd94b97f4b17e6310"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7NM8YsKvHWDotEdZM4BymWBJWfzCaABgEGWYpMeZDh4TOQOErCMoNCez6VORHi62LtXJ+NGWA0qKeNkXQytZCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T09:02:33.813306Z","bundle_sha256":"d4b8f09873b5dd2dd958ca76bd72c7d2566149e1cdc48debc64f0f07eeb66257"}}