{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:2JB2CUU5DUP2YX6RPBFKREWV2Y","short_pith_number":"pith:2JB2CUU5","canonical_record":{"source":{"id":"1410.1131","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2014-10-05T08:03:22Z","cross_cats_sorted":[],"title_canon_sha256":"987eb69d095e33e2d421f5052da456dc6f8f5bfcf17475b700c5675e3a2d515a","abstract_canon_sha256":"deb9c58e2ecb9cce54e184dfd5f0931c22d68e8bb760df015bdcc8f1922ae7a5"},"schema_version":"1.0"},"canonical_sha256":"d243a1529d1d1fac5fd1784aa892d5d60ca4d3223d9da622c6a5ff7828790211","source":{"kind":"arxiv","id":"1410.1131","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1410.1131","created_at":"2026-05-18T01:25:02Z"},{"alias_kind":"arxiv_version","alias_value":"1410.1131v1","created_at":"2026-05-18T01:25:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1410.1131","created_at":"2026-05-18T01:25:02Z"},{"alias_kind":"pith_short_12","alias_value":"2JB2CUU5DUP2","created_at":"2026-05-18T12:28:11Z"},{"alias_kind":"pith_short_16","alias_value":"2JB2CUU5DUP2YX6R","created_at":"2026-05-18T12:28:11Z"},{"alias_kind":"pith_short_8","alias_value":"2JB2CUU5","created_at":"2026-05-18T12:28:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:2JB2CUU5DUP2YX6RPBFKREWV2Y","target":"record","payload":{"canonical_record":{"source":{"id":"1410.1131","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2014-10-05T08:03:22Z","cross_cats_sorted":[],"title_canon_sha256":"987eb69d095e33e2d421f5052da456dc6f8f5bfcf17475b700c5675e3a2d515a","abstract_canon_sha256":"deb9c58e2ecb9cce54e184dfd5f0931c22d68e8bb760df015bdcc8f1922ae7a5"},"schema_version":"1.0"},"canonical_sha256":"d243a1529d1d1fac5fd1784aa892d5d60ca4d3223d9da622c6a5ff7828790211","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:25:02.943972Z","signature_b64":"QoK6zjNxvg3KPCIWMIu4uDlOCD026t7/XjjmJF5e1iFXQD2ARl1HlJoEtN8cxNtrlVNNvwqL4TTxS1geKu/HBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d243a1529d1d1fac5fd1784aa892d5d60ca4d3223d9da622c6a5ff7828790211","last_reissued_at":"2026-05-18T01:25:02.943285Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:25:02.943285Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1410.1131","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":"2026-05-18T01:25:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MuMQ2n1Uw4akKY6d7L+1Hz5pdzvyHIJehme0oZ95XeczAj0EZU6RzkzJNssC55OVUYoxhgMQlo8mFtB+ZaZ7CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T04:55:03.868550Z"},"content_sha256":"98d4957c7b9435c664a5c4bc7fdf60f760001a64f2a60f98f9430c44d7de6b85","schema_version":"1.0","event_id":"sha256:98d4957c7b9435c664a5c4bc7fdf60f760001a64f2a60f98f9430c44d7de6b85"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:2JB2CUU5DUP2YX6RPBFKREWV2Y","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Absolute Position Measurement in a Gas Time Projection Chamber via Transverse Diffusion of Drift Charge","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ins-det","authors_text":"I. Jaegle, I.S. Seong, M.T. Hedges, P.M. Lewis, S.E. Vahsen, T.N. Thorpe","submitted_at":"2014-10-05T08:03:22Z","abstract_excerpt":"Time Projection Chambers (TPCs) with charge readout via micro pattern gaseous detectors can provide detailed measurements of charge density distributions. We here report on measurements of alpha particle tracks, using a TPC where the drift charge is amplified with Gas Electron Multipliers and detected with a pixel ASIC. We find that by measuring the 3-D topology of drift charge and fitting for its transverse diffusion, we obtain the absolute position of tracks in the drift direction. For example, we obtain a precision of 1~cm for 1~cm-long alpha track segments. To our knowledge this is the fir"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1410.1131","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":"2026-05-18T01:25:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GhOH/9q7qL1l6G4HWVDCwyoVhPIKJwMHE0tLiEfzYBPdeHo5rM2dDr0EolPX4bHJRgDi5gOnhjavl63Va1DSCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T04:55:03.869193Z"},"content_sha256":"38dab08348d55f3dfbd1596afdfdbda46e5deed9a48f9bf8b00a3b6d6000e347","schema_version":"1.0","event_id":"sha256:38dab08348d55f3dfbd1596afdfdbda46e5deed9a48f9bf8b00a3b6d6000e347"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2JB2CUU5DUP2YX6RPBFKREWV2Y/bundle.json","state_url":"https://pith.science/pith/2JB2CUU5DUP2YX6RPBFKREWV2Y/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2JB2CUU5DUP2YX6RPBFKREWV2Y/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":"2026-05-27T04:55:03Z","links":{"resolver":"https://pith.science/pith/2JB2CUU5DUP2YX6RPBFKREWV2Y","bundle":"https://pith.science/pith/2JB2CUU5DUP2YX6RPBFKREWV2Y/bundle.json","state":"https://pith.science/pith/2JB2CUU5DUP2YX6RPBFKREWV2Y/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2JB2CUU5DUP2YX6RPBFKREWV2Y/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:2JB2CUU5DUP2YX6RPBFKREWV2Y","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":"deb9c58e2ecb9cce54e184dfd5f0931c22d68e8bb760df015bdcc8f1922ae7a5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2014-10-05T08:03:22Z","title_canon_sha256":"987eb69d095e33e2d421f5052da456dc6f8f5bfcf17475b700c5675e3a2d515a"},"schema_version":"1.0","source":{"id":"1410.1131","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1410.1131","created_at":"2026-05-18T01:25:02Z"},{"alias_kind":"arxiv_version","alias_value":"1410.1131v1","created_at":"2026-05-18T01:25:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1410.1131","created_at":"2026-05-18T01:25:02Z"},{"alias_kind":"pith_short_12","alias_value":"2JB2CUU5DUP2","created_at":"2026-05-18T12:28:11Z"},{"alias_kind":"pith_short_16","alias_value":"2JB2CUU5DUP2YX6R","created_at":"2026-05-18T12:28:11Z"},{"alias_kind":"pith_short_8","alias_value":"2JB2CUU5","created_at":"2026-05-18T12:28:11Z"}],"graph_snapshots":[{"event_id":"sha256:38dab08348d55f3dfbd1596afdfdbda46e5deed9a48f9bf8b00a3b6d6000e347","target":"graph","created_at":"2026-05-18T01:25:02Z","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":"Time Projection Chambers (TPCs) with charge readout via micro pattern gaseous detectors can provide detailed measurements of charge density distributions. We here report on measurements of alpha particle tracks, using a TPC where the drift charge is amplified with Gas Electron Multipliers and detected with a pixel ASIC. We find that by measuring the 3-D topology of drift charge and fitting for its transverse diffusion, we obtain the absolute position of tracks in the drift direction. For example, we obtain a precision of 1~cm for 1~cm-long alpha track segments. To our knowledge this is the fir","authors_text":"I. Jaegle, I.S. Seong, M.T. Hedges, P.M. Lewis, S.E. Vahsen, T.N. Thorpe","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2014-10-05T08:03:22Z","title":"Absolute Position Measurement in a Gas Time Projection Chamber via Transverse Diffusion of Drift Charge"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1410.1131","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":"sha256:98d4957c7b9435c664a5c4bc7fdf60f760001a64f2a60f98f9430c44d7de6b85","target":"record","created_at":"2026-05-18T01:25:02Z","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":"deb9c58e2ecb9cce54e184dfd5f0931c22d68e8bb760df015bdcc8f1922ae7a5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2014-10-05T08:03:22Z","title_canon_sha256":"987eb69d095e33e2d421f5052da456dc6f8f5bfcf17475b700c5675e3a2d515a"},"schema_version":"1.0","source":{"id":"1410.1131","kind":"arxiv","version":1}},"canonical_sha256":"d243a1529d1d1fac5fd1784aa892d5d60ca4d3223d9da622c6a5ff7828790211","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d243a1529d1d1fac5fd1784aa892d5d60ca4d3223d9da622c6a5ff7828790211","first_computed_at":"2026-05-18T01:25:02.943285Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:25:02.943285Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QoK6zjNxvg3KPCIWMIu4uDlOCD026t7/XjjmJF5e1iFXQD2ARl1HlJoEtN8cxNtrlVNNvwqL4TTxS1geKu/HBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:25:02.943972Z","signed_message":"canonical_sha256_bytes"},"source_id":"1410.1131","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:98d4957c7b9435c664a5c4bc7fdf60f760001a64f2a60f98f9430c44d7de6b85","sha256:38dab08348d55f3dfbd1596afdfdbda46e5deed9a48f9bf8b00a3b6d6000e347"],"state_sha256":"29fd21f4a126b117be968ea0a188de5e7a57bf12e462c43f5ea42e92965d41f0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OhFx4GzVkobmzi1l68E6FMGIV+Jf0vD94ivZ8x99hA5Es1PE79GNfTTINXzJ9HSmyJCfEiaZWxbG1n58eJkmAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T04:55:03.872696Z","bundle_sha256":"3fd5aa9ab4eab20666b05634703d1fc8b288579ea6236184a059326f47352b49"}}