{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:G2UVBDG4VI454PWF5PTP3KTTJ7","short_pith_number":"pith:G2UVBDG4","canonical_record":{"source":{"id":"1202.5209","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2012-02-23T15:32:47Z","cross_cats_sorted":[],"title_canon_sha256":"639ba735c53894f3a30c08cb38256ce460995a4657425ae54170e91a3eeee5aa","abstract_canon_sha256":"bb5d4e4c44c5b16c9445dae43c28ad26fd2a471d3a23fcfc4bfb0b2477482844"},"schema_version":"1.0"},"canonical_sha256":"36a9508cdcaa39de3ec5ebe6fdaa734ff173c32300e6028b5f4cfdb7fc42a930","source":{"kind":"arxiv","id":"1202.5209","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.5209","created_at":"2026-05-18T04:01:38Z"},{"alias_kind":"arxiv_version","alias_value":"1202.5209v1","created_at":"2026-05-18T04:01:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.5209","created_at":"2026-05-18T04:01:38Z"},{"alias_kind":"pith_short_12","alias_value":"G2UVBDG4VI45","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"G2UVBDG4VI454PWF","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"G2UVBDG4","created_at":"2026-05-18T12:27:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:G2UVBDG4VI454PWF5PTP3KTTJ7","target":"record","payload":{"canonical_record":{"source":{"id":"1202.5209","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2012-02-23T15:32:47Z","cross_cats_sorted":[],"title_canon_sha256":"639ba735c53894f3a30c08cb38256ce460995a4657425ae54170e91a3eeee5aa","abstract_canon_sha256":"bb5d4e4c44c5b16c9445dae43c28ad26fd2a471d3a23fcfc4bfb0b2477482844"},"schema_version":"1.0"},"canonical_sha256":"36a9508cdcaa39de3ec5ebe6fdaa734ff173c32300e6028b5f4cfdb7fc42a930","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:01:38.721867Z","signature_b64":"4SeTrKSYzjh+Z9goOPn8RTavDfwyE3PI509VeQf+GophkDeO+shdX8GNNhxw9TYECZMDdHvivQuRsCLo5S4wCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"36a9508cdcaa39de3ec5ebe6fdaa734ff173c32300e6028b5f4cfdb7fc42a930","last_reissued_at":"2026-05-18T04:01:38.721333Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:01:38.721333Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1202.5209","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":"2026-05-18T04:01:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CNxuYmrqWzxFYjypg2M8F445FHF/L43MoRqv0yayhKCS3ZbNR4VkhZke8XNSwwZLDZQLU0G/foFVc+P6ADx+BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T13:54:01.396627Z"},"content_sha256":"520a606fc1da04d8c5d90981d82357000989d50ff42a1205d57163b619ddcd13","schema_version":"1.0","event_id":"sha256:520a606fc1da04d8c5d90981d82357000989d50ff42a1205d57163b619ddcd13"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:G2UVBDG4VI454PWF5PTP3KTTJ7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Self-seeding scheme for the soft X-ray line at the European XFEL","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.acc-ph","authors_text":"Evgeni Saldin, Gianluca Geloni, Vitaly Kocharyan","submitted_at":"2012-02-23T15:32:47Z","abstract_excerpt":"This paper discusses the potential for enhancing the capabilities of the European FEL in the soft X-ray regime. A high longitudinal coherence will be the key to such performance upgrade. In order to reach this goal we study a very compact soft X-ray self-seeding scheme originally designed at SLAC [1,2]. The scheme is based on a grating monochromator, and can be straightforwardly installed in the SASE3 undulator beamline at the European XFEL. For the European XFEL fully-coherent soft X-ray pulses are particularly valuable since they naturally support the extraction of more FEL power than at sat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.5209","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":""},"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":"2026-05-18T04:01:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KdEp47CNJ4UORwG3DUs21HlKuzpBxWEHV6IlVyud5UReiY1ew5stSPBj5JeJjsHDxMnrShY9eH30pw55h9WtDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T13:54:01.396976Z"},"content_sha256":"6cd9600aaa76ebebbe43a0d8d4603ebfdae0bb0adb9eac9064818d031a370c2f","schema_version":"1.0","event_id":"sha256:6cd9600aaa76ebebbe43a0d8d4603ebfdae0bb0adb9eac9064818d031a370c2f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G2UVBDG4VI454PWF5PTP3KTTJ7/bundle.json","state_url":"https://pith.science/pith/G2UVBDG4VI454PWF5PTP3KTTJ7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G2UVBDG4VI454PWF5PTP3KTTJ7/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":"2026-06-09T13:54:01Z","links":{"resolver":"https://pith.science/pith/G2UVBDG4VI454PWF5PTP3KTTJ7","bundle":"https://pith.science/pith/G2UVBDG4VI454PWF5PTP3KTTJ7/bundle.json","state":"https://pith.science/pith/G2UVBDG4VI454PWF5PTP3KTTJ7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G2UVBDG4VI454PWF5PTP3KTTJ7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:G2UVBDG4VI454PWF5PTP3KTTJ7","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":"bb5d4e4c44c5b16c9445dae43c28ad26fd2a471d3a23fcfc4bfb0b2477482844","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2012-02-23T15:32:47Z","title_canon_sha256":"639ba735c53894f3a30c08cb38256ce460995a4657425ae54170e91a3eeee5aa"},"schema_version":"1.0","source":{"id":"1202.5209","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1202.5209","created_at":"2026-05-18T04:01:38Z"},{"alias_kind":"arxiv_version","alias_value":"1202.5209v1","created_at":"2026-05-18T04:01:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1202.5209","created_at":"2026-05-18T04:01:38Z"},{"alias_kind":"pith_short_12","alias_value":"G2UVBDG4VI45","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"G2UVBDG4VI454PWF","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"G2UVBDG4","created_at":"2026-05-18T12:27:06Z"}],"graph_snapshots":[{"event_id":"sha256:6cd9600aaa76ebebbe43a0d8d4603ebfdae0bb0adb9eac9064818d031a370c2f","target":"graph","created_at":"2026-05-18T04:01:38Z","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"},"paper":{"abstract_excerpt":"This paper discusses the potential for enhancing the capabilities of the European FEL in the soft X-ray regime. A high longitudinal coherence will be the key to such performance upgrade. In order to reach this goal we study a very compact soft X-ray self-seeding scheme originally designed at SLAC [1,2]. The scheme is based on a grating monochromator, and can be straightforwardly installed in the SASE3 undulator beamline at the European XFEL. For the European XFEL fully-coherent soft X-ray pulses are particularly valuable since they naturally support the extraction of more FEL power than at sat","authors_text":"Evgeni Saldin, Gianluca Geloni, Vitaly Kocharyan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2012-02-23T15:32:47Z","title":"Self-seeding scheme for the soft X-ray line at the European XFEL"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1202.5209","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":"sha256:520a606fc1da04d8c5d90981d82357000989d50ff42a1205d57163b619ddcd13","target":"record","created_at":"2026-05-18T04:01:38Z","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":"bb5d4e4c44c5b16c9445dae43c28ad26fd2a471d3a23fcfc4bfb0b2477482844","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2012-02-23T15:32:47Z","title_canon_sha256":"639ba735c53894f3a30c08cb38256ce460995a4657425ae54170e91a3eeee5aa"},"schema_version":"1.0","source":{"id":"1202.5209","kind":"arxiv","version":1}},"canonical_sha256":"36a9508cdcaa39de3ec5ebe6fdaa734ff173c32300e6028b5f4cfdb7fc42a930","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"36a9508cdcaa39de3ec5ebe6fdaa734ff173c32300e6028b5f4cfdb7fc42a930","first_computed_at":"2026-05-18T04:01:38.721333Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:01:38.721333Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4SeTrKSYzjh+Z9goOPn8RTavDfwyE3PI509VeQf+GophkDeO+shdX8GNNhxw9TYECZMDdHvivQuRsCLo5S4wCg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:01:38.721867Z","signed_message":"canonical_sha256_bytes"},"source_id":"1202.5209","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:520a606fc1da04d8c5d90981d82357000989d50ff42a1205d57163b619ddcd13","sha256:6cd9600aaa76ebebbe43a0d8d4603ebfdae0bb0adb9eac9064818d031a370c2f"],"state_sha256":"e0faad35952b1e95c1b0dd03ed187305a583759dd41330fe241d2f133bf33c1a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bUlpCwAW/hH8jxQRaZp11baRkFnGmKLA9Y6Va+C67wXiATw9XnkmZsUbdFVn91R742IJf9fzU3FKfufsPop4DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T13:54:01.399101Z","bundle_sha256":"de0bc1d3ad78dbb13dc1ca324c192551bdde918f6e70b486be1e465bae191d87"}}