{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:OVGFIZFPL6XLD2DDFVQ3FUPSF6","short_pith_number":"pith:OVGFIZFP","canonical_record":{"source":{"id":"1011.4425","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2010-11-19T13:25:22Z","cross_cats_sorted":[],"title_canon_sha256":"90e7e26d109432c1efb77325708492b28053efa106c729499a035d04939bfc6a","abstract_canon_sha256":"f751c0285eec0028197ec75db758484e6f71a9d6bc106982015dd2342a465d67"},"schema_version":"1.0"},"canonical_sha256":"754c5464af5faeb1e8632d61b2d1f22f91ea401c124d8ed21c0e4db8751bd93b","source":{"kind":"arxiv","id":"1011.4425","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1011.4425","created_at":"2026-05-18T02:04:43Z"},{"alias_kind":"arxiv_version","alias_value":"1011.4425v1","created_at":"2026-05-18T02:04:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1011.4425","created_at":"2026-05-18T02:04:43Z"},{"alias_kind":"pith_short_12","alias_value":"OVGFIZFPL6XL","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_16","alias_value":"OVGFIZFPL6XLD2DD","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_8","alias_value":"OVGFIZFP","created_at":"2026-05-18T12:26:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:OVGFIZFPL6XLD2DDFVQ3FUPSF6","target":"record","payload":{"canonical_record":{"source":{"id":"1011.4425","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2010-11-19T13:25:22Z","cross_cats_sorted":[],"title_canon_sha256":"90e7e26d109432c1efb77325708492b28053efa106c729499a035d04939bfc6a","abstract_canon_sha256":"f751c0285eec0028197ec75db758484e6f71a9d6bc106982015dd2342a465d67"},"schema_version":"1.0"},"canonical_sha256":"754c5464af5faeb1e8632d61b2d1f22f91ea401c124d8ed21c0e4db8751bd93b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:04:43.420206Z","signature_b64":"4hl+vZkbtWP9ZCcK0hzkCcKI4kY6ghxVF6Po/IHQw8vwsZjXYveYoXswxJ5y9dzd8p4YGZGoAozh+u16OYhECw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"754c5464af5faeb1e8632d61b2d1f22f91ea401c124d8ed21c0e4db8751bd93b","last_reissued_at":"2026-05-18T02:04:43.419493Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:04:43.419493Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1011.4425","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":"2026-05-18T02:04:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yt/UKPgWUeiGluSh+cJEdYcQmRvvzLdhbxUgL7sHxr30NZoxGVGzL8qaojTEBhecidFZIzpd1XM1dJ/V1E5nCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T09:42:17.688971Z"},"content_sha256":"9f22551e13d5d4199741f67b45d9d3493566dd2c96ba0d431b2d1ef2f8e5e2cf","schema_version":"1.0","event_id":"sha256:9f22551e13d5d4199741f67b45d9d3493566dd2c96ba0d431b2d1ef2f8e5e2cf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:OVGFIZFPL6XLD2DDFVQ3FUPSF6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The FEL SASE operation, bunch compression and the beam heater","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.acc-ph","authors_text":"E. Sabia, G. Dattoli, M. Labat, M. Migliorati, P. L. Ottaviani, S. Pagnutti","submitted_at":"2010-11-19T13:25:22Z","abstract_excerpt":"We discuss the conditions required for an optimal SASE FEL operation when bunch compression techniques are exploited to enhance the bunch peak current. We discuss the case of velocity bunching and magnetic bunch compression. With the reference to the latter technique we provide a quantitative estimate of the amount of laser heater power necessary to suppress the micro-bunching instability without creating any problem to the SASE dynamics"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1011.4425","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":"2026-05-18T02:04:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xO9OonsG2AGu9b2l/+VmK8t7yWEfiKGbDJw6AD6yL06CuovqOTT32Cd7xsefln8OovCILtYRWoWw+quGLBRuBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T09:42:17.689299Z"},"content_sha256":"7e5763449558dced500c76dadfd27bce6c9e35968ddcd60b942c3b90510fdc1f","schema_version":"1.0","event_id":"sha256:7e5763449558dced500c76dadfd27bce6c9e35968ddcd60b942c3b90510fdc1f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/OVGFIZFPL6XLD2DDFVQ3FUPSF6/bundle.json","state_url":"https://pith.science/pith/OVGFIZFPL6XLD2DDFVQ3FUPSF6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/OVGFIZFPL6XLD2DDFVQ3FUPSF6/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":"2026-06-02T09:42:17Z","links":{"resolver":"https://pith.science/pith/OVGFIZFPL6XLD2DDFVQ3FUPSF6","bundle":"https://pith.science/pith/OVGFIZFPL6XLD2DDFVQ3FUPSF6/bundle.json","state":"https://pith.science/pith/OVGFIZFPL6XLD2DDFVQ3FUPSF6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/OVGFIZFPL6XLD2DDFVQ3FUPSF6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:OVGFIZFPL6XLD2DDFVQ3FUPSF6","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":"f751c0285eec0028197ec75db758484e6f71a9d6bc106982015dd2342a465d67","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2010-11-19T13:25:22Z","title_canon_sha256":"90e7e26d109432c1efb77325708492b28053efa106c729499a035d04939bfc6a"},"schema_version":"1.0","source":{"id":"1011.4425","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1011.4425","created_at":"2026-05-18T02:04:43Z"},{"alias_kind":"arxiv_version","alias_value":"1011.4425v1","created_at":"2026-05-18T02:04:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1011.4425","created_at":"2026-05-18T02:04:43Z"},{"alias_kind":"pith_short_12","alias_value":"OVGFIZFPL6XL","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_16","alias_value":"OVGFIZFPL6XLD2DD","created_at":"2026-05-18T12:26:12Z"},{"alias_kind":"pith_short_8","alias_value":"OVGFIZFP","created_at":"2026-05-18T12:26:12Z"}],"graph_snapshots":[{"event_id":"sha256:7e5763449558dced500c76dadfd27bce6c9e35968ddcd60b942c3b90510fdc1f","target":"graph","created_at":"2026-05-18T02:04:43Z","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"},"paper":{"abstract_excerpt":"We discuss the conditions required for an optimal SASE FEL operation when bunch compression techniques are exploited to enhance the bunch peak current. We discuss the case of velocity bunching and magnetic bunch compression. With the reference to the latter technique we provide a quantitative estimate of the amount of laser heater power necessary to suppress the micro-bunching instability without creating any problem to the SASE dynamics","authors_text":"E. Sabia, G. Dattoli, M. Labat, M. Migliorati, P. L. Ottaviani, S. Pagnutti","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2010-11-19T13:25:22Z","title":"The FEL SASE operation, bunch compression and the beam heater"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1011.4425","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":"sha256:9f22551e13d5d4199741f67b45d9d3493566dd2c96ba0d431b2d1ef2f8e5e2cf","target":"record","created_at":"2026-05-18T02:04:43Z","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":"f751c0285eec0028197ec75db758484e6f71a9d6bc106982015dd2342a465d67","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2010-11-19T13:25:22Z","title_canon_sha256":"90e7e26d109432c1efb77325708492b28053efa106c729499a035d04939bfc6a"},"schema_version":"1.0","source":{"id":"1011.4425","kind":"arxiv","version":1}},"canonical_sha256":"754c5464af5faeb1e8632d61b2d1f22f91ea401c124d8ed21c0e4db8751bd93b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"754c5464af5faeb1e8632d61b2d1f22f91ea401c124d8ed21c0e4db8751bd93b","first_computed_at":"2026-05-18T02:04:43.419493Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:04:43.419493Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"4hl+vZkbtWP9ZCcK0hzkCcKI4kY6ghxVF6Po/IHQw8vwsZjXYveYoXswxJ5y9dzd8p4YGZGoAozh+u16OYhECw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:04:43.420206Z","signed_message":"canonical_sha256_bytes"},"source_id":"1011.4425","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9f22551e13d5d4199741f67b45d9d3493566dd2c96ba0d431b2d1ef2f8e5e2cf","sha256:7e5763449558dced500c76dadfd27bce6c9e35968ddcd60b942c3b90510fdc1f"],"state_sha256":"3c5aa10b1f45479284c3124a7ad14575f83f263f4352cc3e67078f3b4e88e2fc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6uodCsG1eYo/rK7aN3HncJpmvTrxNB4lzFn0hMCXSC/SzyvFsKnk7p4rY+bq3qG21b/2+onG02xi9Azpnx61Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T09:42:17.691180Z","bundle_sha256":"356c956c44a735e6cbb17aecab949c720ce739adceadc35c1b174e9c6d236118"}}