{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:6DNJIU56CT5AACN3UIYSPTXOEY","short_pith_number":"pith:6DNJIU56","canonical_record":{"source":{"id":"1308.5538","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2013-08-26T10:42:29Z","cross_cats_sorted":[],"title_canon_sha256":"7432b7651562c6b371475159bf06dd6a3512fd5173551ab08133cf286a8fa2d2","abstract_canon_sha256":"0d011927a9aec05735568fbbf4d1afbbfd862d30f6e12459697db036fb074669"},"schema_version":"1.0"},"canonical_sha256":"f0da9453be14fa0009bba23127ceee261f52a27f44248b737aeb98c0333557dc","source":{"kind":"arxiv","id":"1308.5538","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.5538","created_at":"2026-05-18T03:14:18Z"},{"alias_kind":"arxiv_version","alias_value":"1308.5538v2","created_at":"2026-05-18T03:14:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.5538","created_at":"2026-05-18T03:14:18Z"},{"alias_kind":"pith_short_12","alias_value":"6DNJIU56CT5A","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_16","alias_value":"6DNJIU56CT5AACN3","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_8","alias_value":"6DNJIU56","created_at":"2026-05-18T12:27:36Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:6DNJIU56CT5AACN3UIYSPTXOEY","target":"record","payload":{"canonical_record":{"source":{"id":"1308.5538","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2013-08-26T10:42:29Z","cross_cats_sorted":[],"title_canon_sha256":"7432b7651562c6b371475159bf06dd6a3512fd5173551ab08133cf286a8fa2d2","abstract_canon_sha256":"0d011927a9aec05735568fbbf4d1afbbfd862d30f6e12459697db036fb074669"},"schema_version":"1.0"},"canonical_sha256":"f0da9453be14fa0009bba23127ceee261f52a27f44248b737aeb98c0333557dc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:14:18.916335Z","signature_b64":"TlNYpbiHLXsaiiLPnKvwL1jqN9mm96oZ+DXECVSIkcaf9XYonlV2IwXjTfVQ8Ya8s7HVQd9sCIPsQji1lBfRAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f0da9453be14fa0009bba23127ceee261f52a27f44248b737aeb98c0333557dc","last_reissued_at":"2026-05-18T03:14:18.915486Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:14:18.915486Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1308.5538","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T03:14:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TrEvHaEpe409WPMJvk2M8x2K0bFc5LWlkae6zXVKU/4z06W+3jmuQy6Cz8HJ4GvGlr1XHatTmtwJEsay2tETDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T17:59:13.932743Z"},"content_sha256":"24bd96b77c69f5ad57d0aeb2179a88363d8ece8aab2e43cf16d22d0f27434d00","schema_version":"1.0","event_id":"sha256:24bd96b77c69f5ad57d0aeb2179a88363d8ece8aab2e43cf16d22d0f27434d00"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:6DNJIU56CT5AACN3UIYSPTXOEY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Investigation of a 2-Colour Undulator FEL Using Puffin","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.acc-ph","authors_text":"B.W.J. McNeil, L.T. Campbell, S. Reiche","submitted_at":"2013-08-26T10:42:29Z","abstract_excerpt":"Initial studies of a 2-colour FEL amplifier using one monoenergetic electron beam are presented. The interaction is modelled using the unaveraged, broadband FEL code Puffin. A series of undulator modules are tuned to generate two resonant frequencies along the FEL interaction and a self-consistent 2-colour FEL interaction at widely spaced non-harmonic wavelengths at 1nm and 2.4nm is demonstrated."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.5538","kind":"arxiv","version":2},"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":"2026-05-18T03:14:18Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fudBDrgXWDFFZQEA4APxpAi8HpzLlkgtH9llFGOjNUsiNdCntwYP+sYczsVkBRBYF/T0tgk3UZn/8NNY4xkjAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T17:59:13.933085Z"},"content_sha256":"a9dacee7f606f9da456e7bed1227475277d4d2a9a4a1d9cc185e52f35359aa38","schema_version":"1.0","event_id":"sha256:a9dacee7f606f9da456e7bed1227475277d4d2a9a4a1d9cc185e52f35359aa38"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6DNJIU56CT5AACN3UIYSPTXOEY/bundle.json","state_url":"https://pith.science/pith/6DNJIU56CT5AACN3UIYSPTXOEY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6DNJIU56CT5AACN3UIYSPTXOEY/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":"2026-06-04T17:59:13Z","links":{"resolver":"https://pith.science/pith/6DNJIU56CT5AACN3UIYSPTXOEY","bundle":"https://pith.science/pith/6DNJIU56CT5AACN3UIYSPTXOEY/bundle.json","state":"https://pith.science/pith/6DNJIU56CT5AACN3UIYSPTXOEY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6DNJIU56CT5AACN3UIYSPTXOEY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:6DNJIU56CT5AACN3UIYSPTXOEY","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":"0d011927a9aec05735568fbbf4d1afbbfd862d30f6e12459697db036fb074669","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2013-08-26T10:42:29Z","title_canon_sha256":"7432b7651562c6b371475159bf06dd6a3512fd5173551ab08133cf286a8fa2d2"},"schema_version":"1.0","source":{"id":"1308.5538","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1308.5538","created_at":"2026-05-18T03:14:18Z"},{"alias_kind":"arxiv_version","alias_value":"1308.5538v2","created_at":"2026-05-18T03:14:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1308.5538","created_at":"2026-05-18T03:14:18Z"},{"alias_kind":"pith_short_12","alias_value":"6DNJIU56CT5A","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_16","alias_value":"6DNJIU56CT5AACN3","created_at":"2026-05-18T12:27:36Z"},{"alias_kind":"pith_short_8","alias_value":"6DNJIU56","created_at":"2026-05-18T12:27:36Z"}],"graph_snapshots":[{"event_id":"sha256:a9dacee7f606f9da456e7bed1227475277d4d2a9a4a1d9cc185e52f35359aa38","target":"graph","created_at":"2026-05-18T03:14:18Z","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":"Initial studies of a 2-colour FEL amplifier using one monoenergetic electron beam are presented. The interaction is modelled using the unaveraged, broadband FEL code Puffin. A series of undulator modules are tuned to generate two resonant frequencies along the FEL interaction and a self-consistent 2-colour FEL interaction at widely spaced non-harmonic wavelengths at 1nm and 2.4nm is demonstrated.","authors_text":"B.W.J. McNeil, L.T. Campbell, S. Reiche","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2013-08-26T10:42:29Z","title":"Investigation of a 2-Colour Undulator FEL Using Puffin"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1308.5538","kind":"arxiv","version":2},"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":"sha256:24bd96b77c69f5ad57d0aeb2179a88363d8ece8aab2e43cf16d22d0f27434d00","target":"record","created_at":"2026-05-18T03:14:18Z","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":"0d011927a9aec05735568fbbf4d1afbbfd862d30f6e12459697db036fb074669","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2013-08-26T10:42:29Z","title_canon_sha256":"7432b7651562c6b371475159bf06dd6a3512fd5173551ab08133cf286a8fa2d2"},"schema_version":"1.0","source":{"id":"1308.5538","kind":"arxiv","version":2}},"canonical_sha256":"f0da9453be14fa0009bba23127ceee261f52a27f44248b737aeb98c0333557dc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f0da9453be14fa0009bba23127ceee261f52a27f44248b737aeb98c0333557dc","first_computed_at":"2026-05-18T03:14:18.915486Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:14:18.915486Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TlNYpbiHLXsaiiLPnKvwL1jqN9mm96oZ+DXECVSIkcaf9XYonlV2IwXjTfVQ8Ya8s7HVQd9sCIPsQji1lBfRAA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:14:18.916335Z","signed_message":"canonical_sha256_bytes"},"source_id":"1308.5538","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:24bd96b77c69f5ad57d0aeb2179a88363d8ece8aab2e43cf16d22d0f27434d00","sha256:a9dacee7f606f9da456e7bed1227475277d4d2a9a4a1d9cc185e52f35359aa38"],"state_sha256":"e3986997afb21cf43ad02caaa59d97fa36e87dc1b53ca732d6b8d6740e6cecf1"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oUlZshj/3VY/uzV++NSost/wgimukFxrWYFABFAfbs0JsH8xbL6sL0lLu6soNcgVRi36zUw/leb5QFhOEx6MCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T17:59:13.935059Z","bundle_sha256":"5d508774d66cafde897a2b9222854a7b87e725ca1ff8ffbeb358eef80c84c43a"}}