{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:GTBDJBON3HM5VIKZF5US2A7X35","short_pith_number":"pith:GTBDJBON","canonical_record":{"source":{"id":"1708.03345","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-08-10T18:18:34Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"2b9ebcac5cc4c111cd9d7df402383d4162f562cf09fd6e581cda00e33fe9c9e6","abstract_canon_sha256":"4ca8f36dc794cbc8d3f2b14d06029d061f1d2d4b6aaf5ca4b3130c42038ebcce"},"schema_version":"1.0"},"canonical_sha256":"34c23485cdd9d9daa1592f692d03f7df511a899567529612436e45b64a6e17b6","source":{"kind":"arxiv","id":"1708.03345","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.03345","created_at":"2026-05-18T00:30:00Z"},{"alias_kind":"arxiv_version","alias_value":"1708.03345v1","created_at":"2026-05-18T00:30:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.03345","created_at":"2026-05-18T00:30:00Z"},{"alias_kind":"pith_short_12","alias_value":"GTBDJBON3HM5","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_16","alias_value":"GTBDJBON3HM5VIKZ","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_8","alias_value":"GTBDJBON","created_at":"2026-05-18T12:31:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:GTBDJBON3HM5VIKZF5US2A7X35","target":"record","payload":{"canonical_record":{"source":{"id":"1708.03345","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-08-10T18:18:34Z","cross_cats_sorted":["hep-ex"],"title_canon_sha256":"2b9ebcac5cc4c111cd9d7df402383d4162f562cf09fd6e581cda00e33fe9c9e6","abstract_canon_sha256":"4ca8f36dc794cbc8d3f2b14d06029d061f1d2d4b6aaf5ca4b3130c42038ebcce"},"schema_version":"1.0"},"canonical_sha256":"34c23485cdd9d9daa1592f692d03f7df511a899567529612436e45b64a6e17b6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:30:00.719366Z","signature_b64":"fps5u3F6lEh/YfMTX4VM5zGocJ9939enURzdv8F+DyzOM7kOw3mv6e0fAjnsrePretWDG5atCH7YwsOW73diDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"34c23485cdd9d9daa1592f692d03f7df511a899567529612436e45b64a6e17b6","last_reissued_at":"2026-05-18T00:30:00.718928Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:30:00.718928Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1708.03345","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":"2026-05-18T00:30:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pCKN7PLpXvUZWdWFlqcdnMUeC0KGFIkf4KLAL0gppsIzrFCHJoADJ3Vde5BY+55E0fmptvwvKK42vEZRFXz4AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T14:53:17.752248Z"},"content_sha256":"da4f748aa5a2b9359e745ca7fb6e42c9b9858e08c6a289fc321c9a9e524dceff","schema_version":"1.0","event_id":"sha256:da4f748aa5a2b9359e745ca7fb6e42c9b9858e08c6a289fc321c9a9e524dceff"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:GTBDJBON3HM5VIKZF5US2A7X35","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Characterisation of Large Area THGEMs and Experimental Measurement of the Townsend Coefficients for CF$_4$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"physics.ins-det","authors_text":"A. C. Ezeribe, A. Scarff, C. Grove, C. Steer, J. Burns, N. J. C. Spooner, T. Crane, W. Lynch","submitted_at":"2017-08-10T18:18:34Z","abstract_excerpt":"Whilst the performance of small THGEMs is well known, here we consider the challenges in scaling these up to large area charge readouts. We first verify the expected gain of larger THGEMs by reporting experimental Townsend coefficients for a 10 cm diameter THGEM in low-pressure CF$_4$. Large area 50 cm by 50 cm THGEMs were sourced from a commercial PCB supplier and geometrical imperfections were observed which we quantified using an optical camera setup. The large area THGEMs were experimentally characterised at Boulby Underground Laboratory through a series of gain calibrations and alpha spec"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.03345","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":"2026-05-18T00:30:00Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GDHOdu/w8WhlIOd31h4684PXgyivc/fNjKwAMnnkmRZi3iaz87uqb/Z1Ek29XdVUPjAZ3MkDjvl/WTszdnRSBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T14:53:17.752884Z"},"content_sha256":"642fd3cd76c98f256e954594d7cf510bddda2ffdb8cb4942fde24e1021c1d9e4","schema_version":"1.0","event_id":"sha256:642fd3cd76c98f256e954594d7cf510bddda2ffdb8cb4942fde24e1021c1d9e4"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GTBDJBON3HM5VIKZF5US2A7X35/bundle.json","state_url":"https://pith.science/pith/GTBDJBON3HM5VIKZF5US2A7X35/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GTBDJBON3HM5VIKZF5US2A7X35/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":"2026-05-29T14:53:17Z","links":{"resolver":"https://pith.science/pith/GTBDJBON3HM5VIKZF5US2A7X35","bundle":"https://pith.science/pith/GTBDJBON3HM5VIKZF5US2A7X35/bundle.json","state":"https://pith.science/pith/GTBDJBON3HM5VIKZF5US2A7X35/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GTBDJBON3HM5VIKZF5US2A7X35/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:GTBDJBON3HM5VIKZF5US2A7X35","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":"4ca8f36dc794cbc8d3f2b14d06029d061f1d2d4b6aaf5ca4b3130c42038ebcce","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-08-10T18:18:34Z","title_canon_sha256":"2b9ebcac5cc4c111cd9d7df402383d4162f562cf09fd6e581cda00e33fe9c9e6"},"schema_version":"1.0","source":{"id":"1708.03345","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.03345","created_at":"2026-05-18T00:30:00Z"},{"alias_kind":"arxiv_version","alias_value":"1708.03345v1","created_at":"2026-05-18T00:30:00Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.03345","created_at":"2026-05-18T00:30:00Z"},{"alias_kind":"pith_short_12","alias_value":"GTBDJBON3HM5","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_16","alias_value":"GTBDJBON3HM5VIKZ","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_8","alias_value":"GTBDJBON","created_at":"2026-05-18T12:31:18Z"}],"graph_snapshots":[{"event_id":"sha256:642fd3cd76c98f256e954594d7cf510bddda2ffdb8cb4942fde24e1021c1d9e4","target":"graph","created_at":"2026-05-18T00:30:00Z","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":"Whilst the performance of small THGEMs is well known, here we consider the challenges in scaling these up to large area charge readouts. We first verify the expected gain of larger THGEMs by reporting experimental Townsend coefficients for a 10 cm diameter THGEM in low-pressure CF$_4$. Large area 50 cm by 50 cm THGEMs were sourced from a commercial PCB supplier and geometrical imperfections were observed which we quantified using an optical camera setup. The large area THGEMs were experimentally characterised at Boulby Underground Laboratory through a series of gain calibrations and alpha spec","authors_text":"A. C. Ezeribe, A. Scarff, C. Grove, C. Steer, J. Burns, N. J. C. Spooner, T. Crane, W. Lynch","cross_cats":["hep-ex"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-08-10T18:18:34Z","title":"Characterisation of Large Area THGEMs and Experimental Measurement of the Townsend Coefficients for CF$_4$"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.03345","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:da4f748aa5a2b9359e745ca7fb6e42c9b9858e08c6a289fc321c9a9e524dceff","target":"record","created_at":"2026-05-18T00:30:00Z","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":"4ca8f36dc794cbc8d3f2b14d06029d061f1d2d4b6aaf5ca4b3130c42038ebcce","cross_cats_sorted":["hep-ex"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ins-det","submitted_at":"2017-08-10T18:18:34Z","title_canon_sha256":"2b9ebcac5cc4c111cd9d7df402383d4162f562cf09fd6e581cda00e33fe9c9e6"},"schema_version":"1.0","source":{"id":"1708.03345","kind":"arxiv","version":1}},"canonical_sha256":"34c23485cdd9d9daa1592f692d03f7df511a899567529612436e45b64a6e17b6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"34c23485cdd9d9daa1592f692d03f7df511a899567529612436e45b64a6e17b6","first_computed_at":"2026-05-18T00:30:00.718928Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:30:00.718928Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fps5u3F6lEh/YfMTX4VM5zGocJ9939enURzdv8F+DyzOM7kOw3mv6e0fAjnsrePretWDG5atCH7YwsOW73diDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:30:00.719366Z","signed_message":"canonical_sha256_bytes"},"source_id":"1708.03345","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:da4f748aa5a2b9359e745ca7fb6e42c9b9858e08c6a289fc321c9a9e524dceff","sha256:642fd3cd76c98f256e954594d7cf510bddda2ffdb8cb4942fde24e1021c1d9e4"],"state_sha256":"5807f4b923b8d2036f0a6c5edc9ab382eae03129412c030b7859f68cd26efb2f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m33VRTGk7siC0AFGmASq/NNhucte91E12w+I5zZO7IXnjb6Wuvh6+jn+h+vfWbbyx24fHK9iTMgcBiAu38H5Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T14:53:17.756678Z","bundle_sha256":"0e155c333147dc682eb8597234c32f559d7801726434fbd1f1642d69df9f4f76"}}