{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:2NLFZCZJUOF5OEKDQYAUFFLIFO","short_pith_number":"pith:2NLFZCZJ","canonical_record":{"source":{"id":"2003.11365","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2020-03-25T12:33:15Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"283295fa39063529bbd27bf6c9d5c63fbe6e7fc1298c4829598b9a79d7a2287f","abstract_canon_sha256":"5b548caf7085576b339cace7d89230920db51ebc3b1f3c23f9e717a0f57943fe"},"schema_version":"1.0"},"canonical_sha256":"d3565c8b29a38bd7114386014295682bb57af1487d123a81a5ab691000218738","source":{"kind":"arxiv","id":"2003.11365","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2003.11365","created_at":"2026-07-05T01:30:27Z"},{"alias_kind":"arxiv_version","alias_value":"2003.11365v1","created_at":"2026-07-05T01:30:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2003.11365","created_at":"2026-07-05T01:30:27Z"},{"alias_kind":"pith_short_12","alias_value":"2NLFZCZJUOF5","created_at":"2026-07-05T01:30:27Z"},{"alias_kind":"pith_short_16","alias_value":"2NLFZCZJUOF5OEKD","created_at":"2026-07-05T01:30:27Z"},{"alias_kind":"pith_short_8","alias_value":"2NLFZCZJ","created_at":"2026-07-05T01:30:27Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:2NLFZCZJUOF5OEKDQYAUFFLIFO","target":"record","payload":{"canonical_record":{"source":{"id":"2003.11365","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2020-03-25T12:33:15Z","cross_cats_sorted":["physics.optics"],"title_canon_sha256":"283295fa39063529bbd27bf6c9d5c63fbe6e7fc1298c4829598b9a79d7a2287f","abstract_canon_sha256":"5b548caf7085576b339cace7d89230920db51ebc3b1f3c23f9e717a0f57943fe"},"schema_version":"1.0"},"canonical_sha256":"d3565c8b29a38bd7114386014295682bb57af1487d123a81a5ab691000218738","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:30:27.609360Z","signature_b64":"zr4c4/fkQZfJvg4V3mlZjICF1cWXQd6VlLwQjpBDjmOkr/6YvpjDawovMDX5DJjR3+fxmGuwNVEzzeSL5BhFBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d3565c8b29a38bd7114386014295682bb57af1487d123a81a5ab691000218738","last_reissued_at":"2026-07-05T01:30:27.608929Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:30:27.608929Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2003.11365","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":"2026-07-05T01:30:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N/2QrsyCgpgz6JOv/9E9c2H0GOBroQIhYD4S/TLwLnq4jAAm0ClsnlZni4fysRNgqQaA6uHpzVBvmIpmqFhsDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T15:27:49.946627Z"},"content_sha256":"3781da216254824306af58aedaf158a88386e0f8c6b487af43957aa27edb0b50","schema_version":"1.0","event_id":"sha256:3781da216254824306af58aedaf158a88386e0f8c6b487af43957aa27edb0b50"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:2NLFZCZJUOF5OEKDQYAUFFLIFO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Free Electron Laser Generation of X-Ray Poincar\\'e Beams","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics"],"primary_cat":"physics.acc-ph","authors_text":"Alison Yao, Brian W. J. McNeil, Erik Hemsing, Jenny Morgan","submitted_at":"2020-03-25T12:33:15Z","abstract_excerpt":"An optics-free method is proposed to generate X-ray radiation with spatially variant states of polarization via an afterburner extension to a Free Electron Laser (FEL). Control of the polarization in the transverse plane is obtained through the overlap of different coherent transverse light distributions radiated from a bunched electron beam in two consecutive orthogonally polarised undulators. Different transverse profiles are obtained by emitting at a higher harmonic in one or both of the undulators. This method enables the generation of beams structured in their intensity, phase, and polari"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2003.11365","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/2003.11365/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":"2026-07-05T01:30:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WOJ+9vZAboApMJ95TQ4KYMbiLw3uhF7pdNz0UKEyCBgKGyOOYOm1kgpLxYurAsLIjSW9gEkaf2WtJ+Zy9KERCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T15:27:49.947158Z"},"content_sha256":"04fab455621350461bbcc36294a938a554580fe072ee4cfe4df41ef485ffe4a6","schema_version":"1.0","event_id":"sha256:04fab455621350461bbcc36294a938a554580fe072ee4cfe4df41ef485ffe4a6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2NLFZCZJUOF5OEKDQYAUFFLIFO/bundle.json","state_url":"https://pith.science/pith/2NLFZCZJUOF5OEKDQYAUFFLIFO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2NLFZCZJUOF5OEKDQYAUFFLIFO/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":"2026-08-11T15:27:49Z","links":{"resolver":"https://pith.science/pith/2NLFZCZJUOF5OEKDQYAUFFLIFO","bundle":"https://pith.science/pith/2NLFZCZJUOF5OEKDQYAUFFLIFO/bundle.json","state":"https://pith.science/pith/2NLFZCZJUOF5OEKDQYAUFFLIFO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2NLFZCZJUOF5OEKDQYAUFFLIFO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:2NLFZCZJUOF5OEKDQYAUFFLIFO","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":"5b548caf7085576b339cace7d89230920db51ebc3b1f3c23f9e717a0f57943fe","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2020-03-25T12:33:15Z","title_canon_sha256":"283295fa39063529bbd27bf6c9d5c63fbe6e7fc1298c4829598b9a79d7a2287f"},"schema_version":"1.0","source":{"id":"2003.11365","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2003.11365","created_at":"2026-07-05T01:30:27Z"},{"alias_kind":"arxiv_version","alias_value":"2003.11365v1","created_at":"2026-07-05T01:30:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2003.11365","created_at":"2026-07-05T01:30:27Z"},{"alias_kind":"pith_short_12","alias_value":"2NLFZCZJUOF5","created_at":"2026-07-05T01:30:27Z"},{"alias_kind":"pith_short_16","alias_value":"2NLFZCZJUOF5OEKD","created_at":"2026-07-05T01:30:27Z"},{"alias_kind":"pith_short_8","alias_value":"2NLFZCZJ","created_at":"2026-07-05T01:30:27Z"}],"graph_snapshots":[{"event_id":"sha256:04fab455621350461bbcc36294a938a554580fe072ee4cfe4df41ef485ffe4a6","target":"graph","created_at":"2026-07-05T01:30:27Z","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/2003.11365/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"An optics-free method is proposed to generate X-ray radiation with spatially variant states of polarization via an afterburner extension to a Free Electron Laser (FEL). Control of the polarization in the transverse plane is obtained through the overlap of different coherent transverse light distributions radiated from a bunched electron beam in two consecutive orthogonally polarised undulators. Different transverse profiles are obtained by emitting at a higher harmonic in one or both of the undulators. This method enables the generation of beams structured in their intensity, phase, and polari","authors_text":"Alison Yao, Brian W. J. McNeil, Erik Hemsing, Jenny Morgan","cross_cats":["physics.optics"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2020-03-25T12:33:15Z","title":"Free Electron Laser Generation of X-Ray Poincar\\'e Beams"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2003.11365","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":"sha256:3781da216254824306af58aedaf158a88386e0f8c6b487af43957aa27edb0b50","target":"record","created_at":"2026-07-05T01:30:27Z","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":"5b548caf7085576b339cace7d89230920db51ebc3b1f3c23f9e717a0f57943fe","cross_cats_sorted":["physics.optics"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2020-03-25T12:33:15Z","title_canon_sha256":"283295fa39063529bbd27bf6c9d5c63fbe6e7fc1298c4829598b9a79d7a2287f"},"schema_version":"1.0","source":{"id":"2003.11365","kind":"arxiv","version":1}},"canonical_sha256":"d3565c8b29a38bd7114386014295682bb57af1487d123a81a5ab691000218738","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d3565c8b29a38bd7114386014295682bb57af1487d123a81a5ab691000218738","first_computed_at":"2026-07-05T01:30:27.608929Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:30:27.608929Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zr4c4/fkQZfJvg4V3mlZjICF1cWXQd6VlLwQjpBDjmOkr/6YvpjDawovMDX5DJjR3+fxmGuwNVEzzeSL5BhFBw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:30:27.609360Z","signed_message":"canonical_sha256_bytes"},"source_id":"2003.11365","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3781da216254824306af58aedaf158a88386e0f8c6b487af43957aa27edb0b50","sha256:04fab455621350461bbcc36294a938a554580fe072ee4cfe4df41ef485ffe4a6"],"state_sha256":"2cf25062c65b4b887a4c38ca715b28ffbca916ab6797798209595a22e0fe4df3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7p9Ga1At3DcfBNYsZSmTXDrghI42N4GaYqLWcMXbPQxT3qlqjN6N73/c4a//L2/7N/k2jyPYii8v+gYzRV1EBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-11T15:27:49.951859Z","bundle_sha256":"4333a7a4c786bc7c46b75d0ae55d4592d74b3b1ed2544729aca5a368270ef5fe"}}