{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:I3TU3H4GQ4WLVUPDLKTC6EIIT2","short_pith_number":"pith:I3TU3H4G","canonical_record":{"source":{"id":"1902.03172","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.acc-ph","submitted_at":"2019-02-08T16:36:09Z","cross_cats_sorted":["physics.plasm-ph"],"title_canon_sha256":"8840b182d37b39ae846697e0fa1e2a99685149175a879baa69cb55d45bcc6a39","abstract_canon_sha256":"3985ac23ae38b535ecda873ca17c829a60ee9913bedee46af1f282ad1c38ba51"},"schema_version":"1.0"},"canonical_sha256":"46e74d9f86872cbad1e35aa62f11089eb21161fba9663517acd88b79843e4bf5","source":{"kind":"arxiv","id":"1902.03172","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.03172","created_at":"2026-05-17T23:39:55Z"},{"alias_kind":"arxiv_version","alias_value":"1902.03172v1","created_at":"2026-05-17T23:39:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.03172","created_at":"2026-05-17T23:39:55Z"},{"alias_kind":"pith_short_12","alias_value":"I3TU3H4GQ4WL","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"I3TU3H4GQ4WLVUPD","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"I3TU3H4G","created_at":"2026-05-18T12:33:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:I3TU3H4GQ4WLVUPDLKTC6EIIT2","target":"record","payload":{"canonical_record":{"source":{"id":"1902.03172","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.acc-ph","submitted_at":"2019-02-08T16:36:09Z","cross_cats_sorted":["physics.plasm-ph"],"title_canon_sha256":"8840b182d37b39ae846697e0fa1e2a99685149175a879baa69cb55d45bcc6a39","abstract_canon_sha256":"3985ac23ae38b535ecda873ca17c829a60ee9913bedee46af1f282ad1c38ba51"},"schema_version":"1.0"},"canonical_sha256":"46e74d9f86872cbad1e35aa62f11089eb21161fba9663517acd88b79843e4bf5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:39:55.062378Z","signature_b64":"TyzYtosR0Ri+MEM9S9xdWv8PE8+zPK3xH+w9xyyJ+ODC62uPlJmxYSSAVBQM/D3X0RlKWKxSqt354EECDWaQCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"46e74d9f86872cbad1e35aa62f11089eb21161fba9663517acd88b79843e4bf5","last_reissued_at":"2026-05-17T23:39:55.061935Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:39:55.061935Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1902.03172","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":"2026-05-17T23:39:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tSTwosRmkznwYtzjoMtYoe4JpdvRMsXa8kkMyHXda7iBaGQJxldJyE0ssodUB2FX5rkcpc/12g0t1qq6MSleDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T02:46:27.917823Z"},"content_sha256":"0545ac499aaf235ff12e1ecd119a9e68dd9b2816c0b9a0019ccc89b3a1e30c15","schema_version":"1.0","event_id":"sha256:0545ac499aaf235ff12e1ecd119a9e68dd9b2816c0b9a0019ccc89b3a1e30c15"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:I3TU3H4GQ4WLVUPDLKTC6EIIT2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Low RF power plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavities","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.plasm-ph"],"primary_cat":"physics.acc-ph","authors_text":"A. Grassellino, B. Giaccone, D. Gonnella, G. Lanza, M. Doleans, M. Martinello, M. Ross, P. Berrutti, S. Kim, T. Khabiboulline","submitted_at":"2019-02-08T16:36:09Z","abstract_excerpt":"Superconducting Radio Frequency (SRF) cavities performance preservation is crucial, from vertical test to accelerator operation. Field Emission (FE) is still one of the performance limiting factors to overcome and plasma cleaning has been proven successful by the Spallation Neutron Source (SNS), in cleaning field emitters and increasing the work function of Nb. A collaboration has been established between Fermi National Accelerator Laboratory (FNAL), SLAC National Accelerator Laboratory and Oak Ridge National Laboratory (ORNL) with the purpose of applying plasma processing to the Linac Coheren"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.03172","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":"2026-05-17T23:39:55Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ao5TNukwzibZcHOqj1Uf275dtJT44TD1sW/55MOMDeI2jCac+RyAnHuuxWPJEIdBs2mYyS5EEjp6nAcmyy0KAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T02:46:27.918166Z"},"content_sha256":"7321388339da31550a11f5f4e6c6613b99e7bf632df698e2fd82b0ab6c4aadc7","schema_version":"1.0","event_id":"sha256:7321388339da31550a11f5f4e6c6613b99e7bf632df698e2fd82b0ab6c4aadc7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/I3TU3H4GQ4WLVUPDLKTC6EIIT2/bundle.json","state_url":"https://pith.science/pith/I3TU3H4GQ4WLVUPDLKTC6EIIT2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/I3TU3H4GQ4WLVUPDLKTC6EIIT2/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":"2026-06-03T02:46:27Z","links":{"resolver":"https://pith.science/pith/I3TU3H4GQ4WLVUPDLKTC6EIIT2","bundle":"https://pith.science/pith/I3TU3H4GQ4WLVUPDLKTC6EIIT2/bundle.json","state":"https://pith.science/pith/I3TU3H4GQ4WLVUPDLKTC6EIIT2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/I3TU3H4GQ4WLVUPDLKTC6EIIT2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:I3TU3H4GQ4WLVUPDLKTC6EIIT2","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":"3985ac23ae38b535ecda873ca17c829a60ee9913bedee46af1f282ad1c38ba51","cross_cats_sorted":["physics.plasm-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.acc-ph","submitted_at":"2019-02-08T16:36:09Z","title_canon_sha256":"8840b182d37b39ae846697e0fa1e2a99685149175a879baa69cb55d45bcc6a39"},"schema_version":"1.0","source":{"id":"1902.03172","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1902.03172","created_at":"2026-05-17T23:39:55Z"},{"alias_kind":"arxiv_version","alias_value":"1902.03172v1","created_at":"2026-05-17T23:39:55Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1902.03172","created_at":"2026-05-17T23:39:55Z"},{"alias_kind":"pith_short_12","alias_value":"I3TU3H4GQ4WL","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"I3TU3H4GQ4WLVUPD","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"I3TU3H4G","created_at":"2026-05-18T12:33:18Z"}],"graph_snapshots":[{"event_id":"sha256:7321388339da31550a11f5f4e6c6613b99e7bf632df698e2fd82b0ab6c4aadc7","target":"graph","created_at":"2026-05-17T23:39:55Z","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":"Superconducting Radio Frequency (SRF) cavities performance preservation is crucial, from vertical test to accelerator operation. Field Emission (FE) is still one of the performance limiting factors to overcome and plasma cleaning has been proven successful by the Spallation Neutron Source (SNS), in cleaning field emitters and increasing the work function of Nb. A collaboration has been established between Fermi National Accelerator Laboratory (FNAL), SLAC National Accelerator Laboratory and Oak Ridge National Laboratory (ORNL) with the purpose of applying plasma processing to the Linac Coheren","authors_text":"A. Grassellino, B. Giaccone, D. Gonnella, G. Lanza, M. Doleans, M. Martinello, M. Ross, P. Berrutti, S. Kim, T. Khabiboulline","cross_cats":["physics.plasm-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.acc-ph","submitted_at":"2019-02-08T16:36:09Z","title":"Low RF power plasma ignition and detection for in-situ cleaning of 1.3 GHz 9-cell cavities"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1902.03172","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":"sha256:0545ac499aaf235ff12e1ecd119a9e68dd9b2816c0b9a0019ccc89b3a1e30c15","target":"record","created_at":"2026-05-17T23:39:55Z","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":"3985ac23ae38b535ecda873ca17c829a60ee9913bedee46af1f282ad1c38ba51","cross_cats_sorted":["physics.plasm-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.acc-ph","submitted_at":"2019-02-08T16:36:09Z","title_canon_sha256":"8840b182d37b39ae846697e0fa1e2a99685149175a879baa69cb55d45bcc6a39"},"schema_version":"1.0","source":{"id":"1902.03172","kind":"arxiv","version":1}},"canonical_sha256":"46e74d9f86872cbad1e35aa62f11089eb21161fba9663517acd88b79843e4bf5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"46e74d9f86872cbad1e35aa62f11089eb21161fba9663517acd88b79843e4bf5","first_computed_at":"2026-05-17T23:39:55.061935Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:39:55.061935Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TyzYtosR0Ri+MEM9S9xdWv8PE8+zPK3xH+w9xyyJ+ODC62uPlJmxYSSAVBQM/D3X0RlKWKxSqt354EECDWaQCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:39:55.062378Z","signed_message":"canonical_sha256_bytes"},"source_id":"1902.03172","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0545ac499aaf235ff12e1ecd119a9e68dd9b2816c0b9a0019ccc89b3a1e30c15","sha256:7321388339da31550a11f5f4e6c6613b99e7bf632df698e2fd82b0ab6c4aadc7"],"state_sha256":"6eb4043161109e9113742071564373a0204a8855b2c3a7e816e799dcf4ff4198"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Hh/8bOC5iQwakhTZR6IhAc5B8XYHUYzIAXv4UhSVc/Kbo8IPxyazc6Fqk8gQWx+2INQx2seShGPUmXInPKImCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T02:46:27.920120Z","bundle_sha256":"af68143df515b3c8b401e392dd93caa2f6f620b20b2cc927e59d664f2f71b35c"}}