{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:55AII7HERASYRXJ4TO6FLTQO44","short_pith_number":"pith:55AII7HE","canonical_record":{"source":{"id":"1508.06353","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2015-08-26T03:35:17Z","cross_cats_sorted":[],"title_canon_sha256":"75df74b0da2a31ae630d0d101e87251178868800a8494e8cd6f26e379dd94be7","abstract_canon_sha256":"a489f52429b8d403f6f53bc3c6bf0c79c1dc529011e56b92e29529749e4c8f29"},"schema_version":"1.0"},"canonical_sha256":"ef40847ce4882588dd3c9bbc55ce0ee704ce6ef856b026a1c5823fde2ff947c9","source":{"kind":"arxiv","id":"1508.06353","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.06353","created_at":"2026-05-18T01:34:43Z"},{"alias_kind":"arxiv_version","alias_value":"1508.06353v1","created_at":"2026-05-18T01:34:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.06353","created_at":"2026-05-18T01:34:43Z"},{"alias_kind":"pith_short_12","alias_value":"55AII7HERASY","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_16","alias_value":"55AII7HERASYRXJ4","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_8","alias_value":"55AII7HE","created_at":"2026-05-18T12:29:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:55AII7HERASYRXJ4TO6FLTQO44","target":"record","payload":{"canonical_record":{"source":{"id":"1508.06353","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2015-08-26T03:35:17Z","cross_cats_sorted":[],"title_canon_sha256":"75df74b0da2a31ae630d0d101e87251178868800a8494e8cd6f26e379dd94be7","abstract_canon_sha256":"a489f52429b8d403f6f53bc3c6bf0c79c1dc529011e56b92e29529749e4c8f29"},"schema_version":"1.0"},"canonical_sha256":"ef40847ce4882588dd3c9bbc55ce0ee704ce6ef856b026a1c5823fde2ff947c9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:34:43.216211Z","signature_b64":"HWit9LgED22ZUcZLuxDwcj56CGluutX9tweAblMj1jpGRMHr0XYV5QycTAPRL4Fn4Ml21TwlPPIcMGXgMA8hBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ef40847ce4882588dd3c9bbc55ce0ee704ce6ef856b026a1c5823fde2ff947c9","last_reissued_at":"2026-05-18T01:34:43.215547Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:34:43.215547Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1508.06353","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":"2026-05-18T01:34:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CHd1jKTPKpC/paVUPAAPnk0wN/tHN7CDAur93q+FEPzNRQNSir/ROPqxpvMEzRuJuxHLzV5NzaI3tjVj9Uh3BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T07:14:47.552064Z"},"content_sha256":"574c98e8d899d3896faa60bb4eee483cead867a890122b6207decafd10ac2c9a","schema_version":"1.0","event_id":"sha256:574c98e8d899d3896faa60bb4eee483cead867a890122b6207decafd10ac2c9a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:55AII7HERASYRXJ4TO6FLTQO44","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Plasma cleaning: A new possible treatment for niobium superconducting cavity after nitrogen doping","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.acc-ph","authors_text":"Datao Xie, Deyu Yang, Jifei Zhao, Kui Zhou, Lin Lin, Weiwei Tan, Xiangyang Lu, Ziqin Yang","submitted_at":"2015-08-26T03:35:17Z","abstract_excerpt":"Nitrogen doping treatment with the subsequent electropolishing (EP) of the niobium superconducting cavity can significantly increase the cavity's quality factor up to a factor of 3. But the process of the EP removal may reintroduce hydrogen in the cavity surface, which may influence the cavity's radio frequency performance. Plasma cleaning study on niobium samples with gas mixtures of argon and oxgen intended to remove contaminations (hydrocarbons and micronicdust particles) from cavity surface to avoid field emission, was performed in Peking University. The niobium samples have been analyzed "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.06353","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":"2026-05-18T01:34:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YWLFJOEG3p1ZlTAsSvLiFQjDK0ywGI7bMl4Xg39eHW3hwF7pRh3wfNGKOy3N5HSUzh0EG6qAOzEEc0tezIU2Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T07:14:47.552744Z"},"content_sha256":"e4f6cc65f965162380842ff6b49088efc9a85ff1c5eb1f547d2e3ae5e982eda6","schema_version":"1.0","event_id":"sha256:e4f6cc65f965162380842ff6b49088efc9a85ff1c5eb1f547d2e3ae5e982eda6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/55AII7HERASYRXJ4TO6FLTQO44/bundle.json","state_url":"https://pith.science/pith/55AII7HERASYRXJ4TO6FLTQO44/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/55AII7HERASYRXJ4TO6FLTQO44/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":"2026-05-31T07:14:47Z","links":{"resolver":"https://pith.science/pith/55AII7HERASYRXJ4TO6FLTQO44","bundle":"https://pith.science/pith/55AII7HERASYRXJ4TO6FLTQO44/bundle.json","state":"https://pith.science/pith/55AII7HERASYRXJ4TO6FLTQO44/state.json","well_known_bundle":"https://pith.science/.well-known/pith/55AII7HERASYRXJ4TO6FLTQO44/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:55AII7HERASYRXJ4TO6FLTQO44","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":"a489f52429b8d403f6f53bc3c6bf0c79c1dc529011e56b92e29529749e4c8f29","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2015-08-26T03:35:17Z","title_canon_sha256":"75df74b0da2a31ae630d0d101e87251178868800a8494e8cd6f26e379dd94be7"},"schema_version":"1.0","source":{"id":"1508.06353","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1508.06353","created_at":"2026-05-18T01:34:43Z"},{"alias_kind":"arxiv_version","alias_value":"1508.06353v1","created_at":"2026-05-18T01:34:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1508.06353","created_at":"2026-05-18T01:34:43Z"},{"alias_kind":"pith_short_12","alias_value":"55AII7HERASY","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_16","alias_value":"55AII7HERASYRXJ4","created_at":"2026-05-18T12:29:05Z"},{"alias_kind":"pith_short_8","alias_value":"55AII7HE","created_at":"2026-05-18T12:29:05Z"}],"graph_snapshots":[{"event_id":"sha256:e4f6cc65f965162380842ff6b49088efc9a85ff1c5eb1f547d2e3ae5e982eda6","target":"graph","created_at":"2026-05-18T01:34:43Z","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":"Nitrogen doping treatment with the subsequent electropolishing (EP) of the niobium superconducting cavity can significantly increase the cavity's quality factor up to a factor of 3. But the process of the EP removal may reintroduce hydrogen in the cavity surface, which may influence the cavity's radio frequency performance. Plasma cleaning study on niobium samples with gas mixtures of argon and oxgen intended to remove contaminations (hydrocarbons and micronicdust particles) from cavity surface to avoid field emission, was performed in Peking University. The niobium samples have been analyzed ","authors_text":"Datao Xie, Deyu Yang, Jifei Zhao, Kui Zhou, Lin Lin, Weiwei Tan, Xiangyang Lu, Ziqin Yang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2015-08-26T03:35:17Z","title":"Plasma cleaning: A new possible treatment for niobium superconducting cavity after nitrogen doping"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1508.06353","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":"sha256:574c98e8d899d3896faa60bb4eee483cead867a890122b6207decafd10ac2c9a","target":"record","created_at":"2026-05-18T01:34:43Z","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":"a489f52429b8d403f6f53bc3c6bf0c79c1dc529011e56b92e29529749e4c8f29","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2015-08-26T03:35:17Z","title_canon_sha256":"75df74b0da2a31ae630d0d101e87251178868800a8494e8cd6f26e379dd94be7"},"schema_version":"1.0","source":{"id":"1508.06353","kind":"arxiv","version":1}},"canonical_sha256":"ef40847ce4882588dd3c9bbc55ce0ee704ce6ef856b026a1c5823fde2ff947c9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ef40847ce4882588dd3c9bbc55ce0ee704ce6ef856b026a1c5823fde2ff947c9","first_computed_at":"2026-05-18T01:34:43.215547Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:34:43.215547Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HWit9LgED22ZUcZLuxDwcj56CGluutX9tweAblMj1jpGRMHr0XYV5QycTAPRL4Fn4Ml21TwlPPIcMGXgMA8hBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:34:43.216211Z","signed_message":"canonical_sha256_bytes"},"source_id":"1508.06353","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:574c98e8d899d3896faa60bb4eee483cead867a890122b6207decafd10ac2c9a","sha256:e4f6cc65f965162380842ff6b49088efc9a85ff1c5eb1f547d2e3ae5e982eda6"],"state_sha256":"aa8bd7660afac487b314b44039c37f35d9cb1355974409d724725ca5a57d9948"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IxokWk9TUTPJ6XJt/GZj1FzQZvXLT/2GgkIvFu2bPybllV5Z+q0/ceVOBtwXdXGxGync78r/gHYuSjDdaOLDAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T07:14:47.556817Z","bundle_sha256":"31dc12377369f64e78f6f2ecc8246e06daf01c7f78222d3cb7ee17dd060b26c1"}}