{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:U347SVZLJ3CWQL5YDKTMTT77HF","short_pith_number":"pith:U347SVZL","canonical_record":{"source":{"id":"1807.09182","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-07-20T21:54:23Z","cross_cats_sorted":[],"title_canon_sha256":"b1140de0a4e0df300be06cca0c02f49e6dea28c53c765b8c52102b0ce268dc6f","abstract_canon_sha256":"f851b7b02aeddb921e4a68e065e47d6de3394be2984df88f5827e62f847dab79"},"schema_version":"1.0"},"canonical_sha256":"a6f9f9572b4ec5682fb81aa6c9cfff39711067cd9770149b6c9da96039e3f3eb","source":{"kind":"arxiv","id":"1807.09182","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.09182","created_at":"2026-05-18T00:09:56Z"},{"alias_kind":"arxiv_version","alias_value":"1807.09182v1","created_at":"2026-05-18T00:09:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.09182","created_at":"2026-05-18T00:09:56Z"},{"alias_kind":"pith_short_12","alias_value":"U347SVZLJ3CW","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"U347SVZLJ3CWQL5Y","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"U347SVZL","created_at":"2026-05-18T12:32:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:U347SVZLJ3CWQL5YDKTMTT77HF","target":"record","payload":{"canonical_record":{"source":{"id":"1807.09182","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-07-20T21:54:23Z","cross_cats_sorted":[],"title_canon_sha256":"b1140de0a4e0df300be06cca0c02f49e6dea28c53c765b8c52102b0ce268dc6f","abstract_canon_sha256":"f851b7b02aeddb921e4a68e065e47d6de3394be2984df88f5827e62f847dab79"},"schema_version":"1.0"},"canonical_sha256":"a6f9f9572b4ec5682fb81aa6c9cfff39711067cd9770149b6c9da96039e3f3eb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:09:56.499633Z","signature_b64":"90voVw4eTXeFcLHkeEP6+tHrijTq47ydhIrRwmQSR+S5uwD3daDswlYptGBOBQi3xRVrHlZnuqrP2XpX9TqABQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a6f9f9572b4ec5682fb81aa6c9cfff39711067cd9770149b6c9da96039e3f3eb","last_reissued_at":"2026-05-18T00:09:56.498812Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:09:56.498812Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.09182","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":"2026-05-18T00:09:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"foQD/rIJ6y9kZltuA+wpqvIGJ1N0MBzHtOWximWeJ6aPY4dzwsvWezrzhNGmjTFmOk/wchV2Ksnjn6xi6Ea9AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T17:42:52.740797Z"},"content_sha256":"06967d049f14d0551fc88611a4cf102dc5c6abe1dcc9c5b492a578e435554fae","schema_version":"1.0","event_id":"sha256:06967d049f14d0551fc88611a4cf102dc5c6abe1dcc9c5b492a578e435554fae"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:U347SVZLJ3CWQL5YDKTMTT77HF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Automated testing of optical fibres: towards the design of the Maunakea Spectroscopic Explorer Fibre Transmission System","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Celine Mazoukh, Colin Bradley, Collin L. Kielty, Darren Erickson, David Crampton, Farbod Jahandar, Jooyoung Lee, Kim A. Venn, Patrick Hall, Stephanie Monty, Victor Nicolov","submitted_at":"2018-07-20T21:54:23Z","abstract_excerpt":"We present the results of an automated fibre optic test bench constructed at the University of Victoria as part of the Maunakea Spectroscopic Explorer (MSE) Fibre Transmission System (FiTS). In preparation for MSE-FiTS, we have begun characterizing the focal ratio degradation (FRD) of candidate multi-mode fibres with the ultimate goal of testing all ~4000 MSE fibres. To achieve this, we have built an optical bench to perform an automated version of the collimated beam test. Herein we present the design of the bench and discuss the automation of components by introducing the Big FiTS Fibre Wrap"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.09182","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":"2026-05-18T00:09:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7AKD/ZxB4QXPouxHS4ddFqBSTbO3J6S9Xfy+l5hM6joanF8riJcuAZ37q+p4KDVCoZJVOEYr3YupC2cxY9P+Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T17:42:52.741518Z"},"content_sha256":"8061ca5142e20304b8c19b6cb9c733e1d737a9c560722f9da7f8ee831cd4a240","schema_version":"1.0","event_id":"sha256:8061ca5142e20304b8c19b6cb9c733e1d737a9c560722f9da7f8ee831cd4a240"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/U347SVZLJ3CWQL5YDKTMTT77HF/bundle.json","state_url":"https://pith.science/pith/U347SVZLJ3CWQL5YDKTMTT77HF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/U347SVZLJ3CWQL5YDKTMTT77HF/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":"2026-05-25T17:42:52Z","links":{"resolver":"https://pith.science/pith/U347SVZLJ3CWQL5YDKTMTT77HF","bundle":"https://pith.science/pith/U347SVZLJ3CWQL5YDKTMTT77HF/bundle.json","state":"https://pith.science/pith/U347SVZLJ3CWQL5YDKTMTT77HF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/U347SVZLJ3CWQL5YDKTMTT77HF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:U347SVZLJ3CWQL5YDKTMTT77HF","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":"f851b7b02aeddb921e4a68e065e47d6de3394be2984df88f5827e62f847dab79","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-07-20T21:54:23Z","title_canon_sha256":"b1140de0a4e0df300be06cca0c02f49e6dea28c53c765b8c52102b0ce268dc6f"},"schema_version":"1.0","source":{"id":"1807.09182","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.09182","created_at":"2026-05-18T00:09:56Z"},{"alias_kind":"arxiv_version","alias_value":"1807.09182v1","created_at":"2026-05-18T00:09:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.09182","created_at":"2026-05-18T00:09:56Z"},{"alias_kind":"pith_short_12","alias_value":"U347SVZLJ3CW","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"U347SVZLJ3CWQL5Y","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"U347SVZL","created_at":"2026-05-18T12:32:56Z"}],"graph_snapshots":[{"event_id":"sha256:8061ca5142e20304b8c19b6cb9c733e1d737a9c560722f9da7f8ee831cd4a240","target":"graph","created_at":"2026-05-18T00:09:56Z","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":"We present the results of an automated fibre optic test bench constructed at the University of Victoria as part of the Maunakea Spectroscopic Explorer (MSE) Fibre Transmission System (FiTS). In preparation for MSE-FiTS, we have begun characterizing the focal ratio degradation (FRD) of candidate multi-mode fibres with the ultimate goal of testing all ~4000 MSE fibres. To achieve this, we have built an optical bench to perform an automated version of the collimated beam test. Herein we present the design of the bench and discuss the automation of components by introducing the Big FiTS Fibre Wrap","authors_text":"Celine Mazoukh, Colin Bradley, Collin L. Kielty, Darren Erickson, David Crampton, Farbod Jahandar, Jooyoung Lee, Kim A. Venn, Patrick Hall, Stephanie Monty, Victor Nicolov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-07-20T21:54:23Z","title":"Automated testing of optical fibres: towards the design of the Maunakea Spectroscopic Explorer Fibre Transmission System"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.09182","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":"sha256:06967d049f14d0551fc88611a4cf102dc5c6abe1dcc9c5b492a578e435554fae","target":"record","created_at":"2026-05-18T00:09:56Z","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":"f851b7b02aeddb921e4a68e065e47d6de3394be2984df88f5827e62f847dab79","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-07-20T21:54:23Z","title_canon_sha256":"b1140de0a4e0df300be06cca0c02f49e6dea28c53c765b8c52102b0ce268dc6f"},"schema_version":"1.0","source":{"id":"1807.09182","kind":"arxiv","version":1}},"canonical_sha256":"a6f9f9572b4ec5682fb81aa6c9cfff39711067cd9770149b6c9da96039e3f3eb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a6f9f9572b4ec5682fb81aa6c9cfff39711067cd9770149b6c9da96039e3f3eb","first_computed_at":"2026-05-18T00:09:56.498812Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:09:56.498812Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"90voVw4eTXeFcLHkeEP6+tHrijTq47ydhIrRwmQSR+S5uwD3daDswlYptGBOBQi3xRVrHlZnuqrP2XpX9TqABQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:09:56.499633Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.09182","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:06967d049f14d0551fc88611a4cf102dc5c6abe1dcc9c5b492a578e435554fae","sha256:8061ca5142e20304b8c19b6cb9c733e1d737a9c560722f9da7f8ee831cd4a240"],"state_sha256":"eb0b26d04d6aec52e04fcd5a90c87a8b5f3255e9c71186afd251acb9e32909f3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NHgHRe1xE+wODmx3+iCRFJygBY1+rMA7ZJcW3Z/O/B1HaxGpmzEXZ1TJstsDkw65wh5xr772czwOmkkWsZMSAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T17:42:52.745409Z","bundle_sha256":"739ce3ccc8337cc30485f904d47170ebb656ec2ffc356543a35fd9d1806cf718"}}