{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:SZSBFXIPX3YG7NOCKKZW4SQ72Z","short_pith_number":"pith:SZSBFXIP","canonical_record":{"source":{"id":"1801.03823","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2018-01-11T15:37:50Z","cross_cats_sorted":[],"title_canon_sha256":"6c6debd663b4336b5ae8175ccaa506d33a68203e7fa77a701478928ab3ca81d2","abstract_canon_sha256":"1db27aada205ecb1b34927706d5a1d4eb5888d9c1ab2ef2b2f752ff82265fb48"},"schema_version":"1.0"},"canonical_sha256":"966412dd0fbef06fb5c252b36e4a1fd657e466e3cd0a294f5436320ca87879ea","source":{"kind":"arxiv","id":"1801.03823","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.03823","created_at":"2026-05-17T23:57:42Z"},{"alias_kind":"arxiv_version","alias_value":"1801.03823v1","created_at":"2026-05-17T23:57:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.03823","created_at":"2026-05-17T23:57:42Z"},{"alias_kind":"pith_short_12","alias_value":"SZSBFXIPX3YG","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_16","alias_value":"SZSBFXIPX3YG7NOC","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_8","alias_value":"SZSBFXIP","created_at":"2026-05-18T12:32:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:SZSBFXIPX3YG7NOCKKZW4SQ72Z","target":"record","payload":{"canonical_record":{"source":{"id":"1801.03823","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2018-01-11T15:37:50Z","cross_cats_sorted":[],"title_canon_sha256":"6c6debd663b4336b5ae8175ccaa506d33a68203e7fa77a701478928ab3ca81d2","abstract_canon_sha256":"1db27aada205ecb1b34927706d5a1d4eb5888d9c1ab2ef2b2f752ff82265fb48"},"schema_version":"1.0"},"canonical_sha256":"966412dd0fbef06fb5c252b36e4a1fd657e466e3cd0a294f5436320ca87879ea","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:57:42.454129Z","signature_b64":"DJC+k6R2U01uM1g89ttibfb6uc+kQi784XxuW5yPJa+zwPzxr/RipHF81zJJg+OpSnzc9hM5V9LlbvsbVoi9AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"966412dd0fbef06fb5c252b36e4a1fd657e466e3cd0a294f5436320ca87879ea","last_reissued_at":"2026-05-17T23:57:42.453778Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:57:42.453778Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.03823","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":"2026-05-17T23:57:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C/FMsaLjtw1XK5FBekLz+TWdMYQgFLRCF9R8um34pJcLARzLPs6JwKu69nd9dr71+HSg/Nm33AWxNrott1UwDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T11:23:57.099803Z"},"content_sha256":"4441b4ea53440a1fe48544ec248f93ca7758b5b076f74597d346054cf3285768","schema_version":"1.0","event_id":"sha256:4441b4ea53440a1fe48544ec248f93ca7758b5b076f74597d346054cf3285768"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:SZSBFXIPX3YG7NOCKKZW4SQ72Z","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Nano-machining, surface analysis and emittance measurements of a copper photocathode at SPARC_LAB","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.acc-ph","authors_text":"A. Biagioni, A. Cianchi, A. Giribono, A. Lorusso, A. Mostacci, A. Perrone, A. Stella, D. Alesini, D. Di Giovenale, D. H. Dowell, D. Passeri, E. Chiadroni, F. Bisesto, F. Cardelli, F. Micciulla, F. Villa, G. Costa, G. Di Pirro, J. Scifo, L. Piersanti, M. Bellaveglia, M. Ferrario, M.P. Anania, M. Trov\\`o, R. Di Raddo, R. Pompili, S. Bellucci, V. Shpakov","submitted_at":"2018-01-11T15:37:50Z","abstract_excerpt":"R\\&D activity on Cu photocathodes is under development at the SPARC\\_LAB test facility to fully characterize each stage of the photocathode \"life\" and to have a complete overview of the photoemission properties in high brightness photo-injectors. The nano(n)-machining process presented here consists in diamond milling, and blowing with dry nitrogen. This procedure reduces the roughness of the cathode surface and prevents surface contamination introduced by other techniques, such as polishing with diamond paste or the machining with oil. Both high roughness and surface contamination cause an in"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.03823","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":"2026-05-17T23:57:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yIm7oAZYkSOFFAVNOjda9n7yXaiCv2zgNrVEQOsnFpnyfcFIELZHgOYJDGPuPnGQv86ba56lyndMk3ZTa7YOBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T11:23:57.100513Z"},"content_sha256":"95f2f01033adb51cd887f233768c08b4860139d64b226df3f031fdc1b53f51c4","schema_version":"1.0","event_id":"sha256:95f2f01033adb51cd887f233768c08b4860139d64b226df3f031fdc1b53f51c4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SZSBFXIPX3YG7NOCKKZW4SQ72Z/bundle.json","state_url":"https://pith.science/pith/SZSBFXIPX3YG7NOCKKZW4SQ72Z/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SZSBFXIPX3YG7NOCKKZW4SQ72Z/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":"2026-05-31T11:23:57Z","links":{"resolver":"https://pith.science/pith/SZSBFXIPX3YG7NOCKKZW4SQ72Z","bundle":"https://pith.science/pith/SZSBFXIPX3YG7NOCKKZW4SQ72Z/bundle.json","state":"https://pith.science/pith/SZSBFXIPX3YG7NOCKKZW4SQ72Z/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SZSBFXIPX3YG7NOCKKZW4SQ72Z/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:SZSBFXIPX3YG7NOCKKZW4SQ72Z","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":"1db27aada205ecb1b34927706d5a1d4eb5888d9c1ab2ef2b2f752ff82265fb48","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2018-01-11T15:37:50Z","title_canon_sha256":"6c6debd663b4336b5ae8175ccaa506d33a68203e7fa77a701478928ab3ca81d2"},"schema_version":"1.0","source":{"id":"1801.03823","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.03823","created_at":"2026-05-17T23:57:42Z"},{"alias_kind":"arxiv_version","alias_value":"1801.03823v1","created_at":"2026-05-17T23:57:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.03823","created_at":"2026-05-17T23:57:42Z"},{"alias_kind":"pith_short_12","alias_value":"SZSBFXIPX3YG","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_16","alias_value":"SZSBFXIPX3YG7NOC","created_at":"2026-05-18T12:32:53Z"},{"alias_kind":"pith_short_8","alias_value":"SZSBFXIP","created_at":"2026-05-18T12:32:53Z"}],"graph_snapshots":[{"event_id":"sha256:95f2f01033adb51cd887f233768c08b4860139d64b226df3f031fdc1b53f51c4","target":"graph","created_at":"2026-05-17T23:57:42Z","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":"R\\&D activity on Cu photocathodes is under development at the SPARC\\_LAB test facility to fully characterize each stage of the photocathode \"life\" and to have a complete overview of the photoemission properties in high brightness photo-injectors. The nano(n)-machining process presented here consists in diamond milling, and blowing with dry nitrogen. This procedure reduces the roughness of the cathode surface and prevents surface contamination introduced by other techniques, such as polishing with diamond paste or the machining with oil. Both high roughness and surface contamination cause an in","authors_text":"A. Biagioni, A. Cianchi, A. Giribono, A. Lorusso, A. Mostacci, A. Perrone, A. Stella, D. Alesini, D. Di Giovenale, D. H. Dowell, D. Passeri, E. Chiadroni, F. Bisesto, F. Cardelli, F. Micciulla, F. Villa, G. Costa, G. Di Pirro, J. Scifo, L. Piersanti, M. Bellaveglia, M. Ferrario, M.P. Anania, M. Trov\\`o, R. Di Raddo, R. Pompili, S. Bellucci, V. Shpakov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2018-01-11T15:37:50Z","title":"Nano-machining, surface analysis and emittance measurements of a copper photocathode at SPARC_LAB"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.03823","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":"sha256:4441b4ea53440a1fe48544ec248f93ca7758b5b076f74597d346054cf3285768","target":"record","created_at":"2026-05-17T23:57:42Z","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":"1db27aada205ecb1b34927706d5a1d4eb5888d9c1ab2ef2b2f752ff82265fb48","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2018-01-11T15:37:50Z","title_canon_sha256":"6c6debd663b4336b5ae8175ccaa506d33a68203e7fa77a701478928ab3ca81d2"},"schema_version":"1.0","source":{"id":"1801.03823","kind":"arxiv","version":1}},"canonical_sha256":"966412dd0fbef06fb5c252b36e4a1fd657e466e3cd0a294f5436320ca87879ea","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"966412dd0fbef06fb5c252b36e4a1fd657e466e3cd0a294f5436320ca87879ea","first_computed_at":"2026-05-17T23:57:42.453778Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:57:42.453778Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DJC+k6R2U01uM1g89ttibfb6uc+kQi784XxuW5yPJa+zwPzxr/RipHF81zJJg+OpSnzc9hM5V9LlbvsbVoi9AQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:57:42.454129Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.03823","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4441b4ea53440a1fe48544ec248f93ca7758b5b076f74597d346054cf3285768","sha256:95f2f01033adb51cd887f233768c08b4860139d64b226df3f031fdc1b53f51c4"],"state_sha256":"9da4c77aad956cde541e1bac655bc06cf973842bff85625051f6426f491e6dc3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5wo27EXdhVU9luC5kiypiBufqjGVVtMd48uVrFQJFxpFURAJnqAT4adju8NXjLJKmgV/6A321VDwU22imCvdDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T11:23:57.104833Z","bundle_sha256":"688e7080ff4828c5615b116dd7fb3ddb893d555b50b5b48225e8a03f1ae4413c"}}