{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:QZNPFOOG72SXQCUAREQJTZ433M","short_pith_number":"pith:QZNPFOOG","canonical_record":{"source":{"id":"1811.08332","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2018-11-20T16:01:12Z","cross_cats_sorted":[],"title_canon_sha256":"42b30780b6fbdb704c958a24eb4df40e4e46f8dde01b8a9627993463d3f09e0c","abstract_canon_sha256":"ac7ce5bc7595d4df7d303a8a45b44a9b381d922a44c298b3940bc89abe50c09f"},"schema_version":"1.0"},"canonical_sha256":"865af2b9c6fea5780a80892099e79bdb380459edcdb0036ddfd275bd32ec1b8e","source":{"kind":"arxiv","id":"1811.08332","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.08332","created_at":"2026-07-05T00:38:53Z"},{"alias_kind":"arxiv_version","alias_value":"1811.08332v1","created_at":"2026-07-05T00:38:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.08332","created_at":"2026-07-05T00:38:53Z"},{"alias_kind":"pith_short_12","alias_value":"QZNPFOOG72SX","created_at":"2026-07-05T00:38:53Z"},{"alias_kind":"pith_short_16","alias_value":"QZNPFOOG72SXQCUA","created_at":"2026-07-05T00:38:53Z"},{"alias_kind":"pith_short_8","alias_value":"QZNPFOOG","created_at":"2026-07-05T00:38:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:QZNPFOOG72SXQCUAREQJTZ433M","target":"record","payload":{"canonical_record":{"source":{"id":"1811.08332","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2018-11-20T16:01:12Z","cross_cats_sorted":[],"title_canon_sha256":"42b30780b6fbdb704c958a24eb4df40e4e46f8dde01b8a9627993463d3f09e0c","abstract_canon_sha256":"ac7ce5bc7595d4df7d303a8a45b44a9b381d922a44c298b3940bc89abe50c09f"},"schema_version":"1.0"},"canonical_sha256":"865af2b9c6fea5780a80892099e79bdb380459edcdb0036ddfd275bd32ec1b8e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:38:53.224001Z","signature_b64":"EWeWNcWsHwNYMif3FkGfAIglzYoCBOYmt9WRZOOhJwIp97dTVBCRF9Bg1ZoKtJ4jpQq7CTvdy9oW5yYGpSleBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"865af2b9c6fea5780a80892099e79bdb380459edcdb0036ddfd275bd32ec1b8e","last_reissued_at":"2026-07-05T00:38:53.223429Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:38:53.223429Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1811.08332","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":"2026-07-05T00:38:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"T+ewRcEKkYosfkchPKWMlm/+m59PZu5Ac0EdsjR4xJM7sh9ShqwFJlZCL1zh64DyaLKOCy9epa+XSXB5af6cDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T15:55:13.145521Z"},"content_sha256":"b89f5b1e5c8e5387c963ce73f76e09828500c76cbaf4e936b26fdf9d0ab890d8","schema_version":"1.0","event_id":"sha256:b89f5b1e5c8e5387c963ce73f76e09828500c76cbaf4e936b26fdf9d0ab890d8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:QZNPFOOG72SXQCUAREQJTZ433M","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"muCool: A next step towards efficient muon beam compression","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.acc-ph","authors_text":"A. Antognini, A. Eggenberger, A. Knecht, A. Papa, A. Stoykov, C. Petitjean, D.M. Kaplan, D. Taqqu, F. M. Piegsa, G. Wichmann, I. Belosevic, K. Kirch, K. S. Khaw, M. Hildebrandt, N. Ritjoho, R. Iwai, T. J.Phillips, Y. Bao","submitted_at":"2018-11-20T16:01:12Z","abstract_excerpt":"A novel device to compress the phase space of a muon beam by a factor of $10^{10}$ with a $10^{-3}$ efficiency is under development. A surface muon beam is stopped in a helium gas target consisting of several compression stages, wherein strong electric and magnetic fields are applied. The spatial extent of the stopped muon swarm is decreased by means of these fields until muons with eV energy are extracted into vacuum through a small orifice. It was measured that a 20 cm long muon stop distribution can be compressed in longitudinal direction to sub-mm extent within 2 ${\\rm \\mu s}$. Additionall"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.08332","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1811.08332/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:38:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SDGnU5Ln5kpuczXYeTNCDxfLP269Bthil0NpQyAz+PuTXwBlAxMCa3OUtiBoiFcpzd/7bneGjMbq1EQ3RR7IDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T15:55:13.145919Z"},"content_sha256":"db11692e57dc1a082be66be9bac4c8a11ec43bf7e8a6e21d4ce88bdf49840007","schema_version":"1.0","event_id":"sha256:db11692e57dc1a082be66be9bac4c8a11ec43bf7e8a6e21d4ce88bdf49840007"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QZNPFOOG72SXQCUAREQJTZ433M/bundle.json","state_url":"https://pith.science/pith/QZNPFOOG72SXQCUAREQJTZ433M/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QZNPFOOG72SXQCUAREQJTZ433M/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":"2026-07-05T15:55:13Z","links":{"resolver":"https://pith.science/pith/QZNPFOOG72SXQCUAREQJTZ433M","bundle":"https://pith.science/pith/QZNPFOOG72SXQCUAREQJTZ433M/bundle.json","state":"https://pith.science/pith/QZNPFOOG72SXQCUAREQJTZ433M/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QZNPFOOG72SXQCUAREQJTZ433M/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:QZNPFOOG72SXQCUAREQJTZ433M","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":"ac7ce5bc7595d4df7d303a8a45b44a9b381d922a44c298b3940bc89abe50c09f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2018-11-20T16:01:12Z","title_canon_sha256":"42b30780b6fbdb704c958a24eb4df40e4e46f8dde01b8a9627993463d3f09e0c"},"schema_version":"1.0","source":{"id":"1811.08332","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.08332","created_at":"2026-07-05T00:38:53Z"},{"alias_kind":"arxiv_version","alias_value":"1811.08332v1","created_at":"2026-07-05T00:38:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.08332","created_at":"2026-07-05T00:38:53Z"},{"alias_kind":"pith_short_12","alias_value":"QZNPFOOG72SX","created_at":"2026-07-05T00:38:53Z"},{"alias_kind":"pith_short_16","alias_value":"QZNPFOOG72SXQCUA","created_at":"2026-07-05T00:38:53Z"},{"alias_kind":"pith_short_8","alias_value":"QZNPFOOG","created_at":"2026-07-05T00:38:53Z"}],"graph_snapshots":[{"event_id":"sha256:db11692e57dc1a082be66be9bac4c8a11ec43bf7e8a6e21d4ce88bdf49840007","target":"graph","created_at":"2026-07-05T00:38:53Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1811.08332/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"A novel device to compress the phase space of a muon beam by a factor of $10^{10}$ with a $10^{-3}$ efficiency is under development. A surface muon beam is stopped in a helium gas target consisting of several compression stages, wherein strong electric and magnetic fields are applied. The spatial extent of the stopped muon swarm is decreased by means of these fields until muons with eV energy are extracted into vacuum through a small orifice. It was measured that a 20 cm long muon stop distribution can be compressed in longitudinal direction to sub-mm extent within 2 ${\\rm \\mu s}$. Additionall","authors_text":"A. Antognini, A. Eggenberger, A. Knecht, A. Papa, A. Stoykov, C. Petitjean, D.M. Kaplan, D. Taqqu, F. M. Piegsa, G. Wichmann, I. Belosevic, K. Kirch, K. S. Khaw, M. Hildebrandt, N. Ritjoho, R. Iwai, T. J.Phillips, Y. Bao","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2018-11-20T16:01:12Z","title":"muCool: A next step towards efficient muon beam compression"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.08332","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:b89f5b1e5c8e5387c963ce73f76e09828500c76cbaf4e936b26fdf9d0ab890d8","target":"record","created_at":"2026-07-05T00:38:53Z","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":"ac7ce5bc7595d4df7d303a8a45b44a9b381d922a44c298b3940bc89abe50c09f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.acc-ph","submitted_at":"2018-11-20T16:01:12Z","title_canon_sha256":"42b30780b6fbdb704c958a24eb4df40e4e46f8dde01b8a9627993463d3f09e0c"},"schema_version":"1.0","source":{"id":"1811.08332","kind":"arxiv","version":1}},"canonical_sha256":"865af2b9c6fea5780a80892099e79bdb380459edcdb0036ddfd275bd32ec1b8e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"865af2b9c6fea5780a80892099e79bdb380459edcdb0036ddfd275bd32ec1b8e","first_computed_at":"2026-07-05T00:38:53.223429Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:38:53.223429Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"EWeWNcWsHwNYMif3FkGfAIglzYoCBOYmt9WRZOOhJwIp97dTVBCRF9Bg1ZoKtJ4jpQq7CTvdy9oW5yYGpSleBg==","signature_status":"signed_v1","signed_at":"2026-07-05T00:38:53.224001Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.08332","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b89f5b1e5c8e5387c963ce73f76e09828500c76cbaf4e936b26fdf9d0ab890d8","sha256:db11692e57dc1a082be66be9bac4c8a11ec43bf7e8a6e21d4ce88bdf49840007"],"state_sha256":"92b9981c42fdad8a74cce847b8b03a3100ec2b336938ac4261b5025071451cf7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mlpJYcrmyixf7ncHl4iAQPooHuGW2oGNix5cjV+MZ7fRqmiaoi1K12wwe3NXD4GJ1UnYExrAbW6nqwh9/7N+CQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T15:55:13.148386Z","bundle_sha256":"adb6cca54475d6d39ed8a3a9bb4e7c69f63534c1c08c90ecb3918d9d79b121fa"}}