{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:UJPN3N75EBWDYTO5ZSH3XHUXNH","short_pith_number":"pith:UJPN3N75","canonical_record":{"source":{"id":"1807.08075","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2018-07-21T03:20:59Z","cross_cats_sorted":["physics.acc-ph","physics.app-ph"],"title_canon_sha256":"774197cb8585b374bbdd4c65a369a13e071b5048951514d6038bb1dab144dde9","abstract_canon_sha256":"d6940eb5d7d14bcfb82e4bd5fbb0d9688c562c7f4eb5ebd5fd16701f69a5b00e"},"schema_version":"1.0"},"canonical_sha256":"a25eddb7fd206c3c4dddcc8fbb9e9769c9d6ee0daf2c21bf57bc9247efef8c7c","source":{"kind":"arxiv","id":"1807.08075","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.08075","created_at":"2026-05-17T23:49:22Z"},{"alias_kind":"arxiv_version","alias_value":"1807.08075v1","created_at":"2026-05-17T23:49:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.08075","created_at":"2026-05-17T23:49:22Z"},{"alias_kind":"pith_short_12","alias_value":"UJPN3N75EBWD","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"UJPN3N75EBWDYTO5","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"UJPN3N75","created_at":"2026-05-18T12:32:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:UJPN3N75EBWDYTO5ZSH3XHUXNH","target":"record","payload":{"canonical_record":{"source":{"id":"1807.08075","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2018-07-21T03:20:59Z","cross_cats_sorted":["physics.acc-ph","physics.app-ph"],"title_canon_sha256":"774197cb8585b374bbdd4c65a369a13e071b5048951514d6038bb1dab144dde9","abstract_canon_sha256":"d6940eb5d7d14bcfb82e4bd5fbb0d9688c562c7f4eb5ebd5fd16701f69a5b00e"},"schema_version":"1.0"},"canonical_sha256":"a25eddb7fd206c3c4dddcc8fbb9e9769c9d6ee0daf2c21bf57bc9247efef8c7c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:49:22.388238Z","signature_b64":"P7v6+66c7tyGFYoscCY3OZNznXzZCFh8Q3luAyez1z6RRHzrZtRNP6oJ1esQLVQ6MQLQacl/ZeUysNwWjoBRBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a25eddb7fd206c3c4dddcc8fbb9e9769c9d6ee0daf2c21bf57bc9247efef8c7c","last_reissued_at":"2026-05-17T23:49:22.387659Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:49:22.387659Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.08075","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":"2026-05-17T23:49:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FA5y0rcduxou+41OzOT2QuppLzLFVnM0XA/y+lXGSQU3fHC95KAs5m8rhkKmS8laC8pEbgLJ7oVvjxBppWcZAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T17:19:34.461298Z"},"content_sha256":"4cd3c4f7398c276bf6be3cf44e2d62bba16e78e50f8ed67139bedb576289e2dc","schema_version":"1.0","event_id":"sha256:4cd3c4f7398c276bf6be3cf44e2d62bba16e78e50f8ed67139bedb576289e2dc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:UJPN3N75EBWDYTO5ZSH3XHUXNH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Highly collimated electron acceleration by longitudinal laser fields in a hollow-core target","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.acc-ph","physics.app-ph"],"primary_cat":"physics.plasm-ph","authors_text":"A. P. L. Robinson, A. V. Arefiev, X. Q. Yan, Z. Gong","submitted_at":"2018-07-21T03:20:59Z","abstract_excerpt":"The substantial angular divergence of electron beams produced by direct laser acceleration is often considered as an inherent negative feature of the mechanism. The divergence however arises primarily because the standard approach relies on transverse electron oscillations and their interplay with the transverse electric fields of the laser pulse. We propose a conceptually different approach to direct laser acceleration that leverages longitudinal laser electric fields that are present in a tightly focused laser beam. A structured hollow-core target is used to enhance the longitudinal fields a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.08075","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":"2026-05-17T23:49:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cqua1iO8kmbyHZAwyPbIez25ERhTNpwfEV2j+pa7AvynyJ+uG6TEVjiuenpHTklfCkRzYQd3JqsuWHovEjjoCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T17:19:34.461848Z"},"content_sha256":"7cd7b2e533e12ab3fe434f739cafed23af39ecaba809f3a4102695c8330ba19a","schema_version":"1.0","event_id":"sha256:7cd7b2e533e12ab3fe434f739cafed23af39ecaba809f3a4102695c8330ba19a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UJPN3N75EBWDYTO5ZSH3XHUXNH/bundle.json","state_url":"https://pith.science/pith/UJPN3N75EBWDYTO5ZSH3XHUXNH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UJPN3N75EBWDYTO5ZSH3XHUXNH/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":"2026-05-31T17:19:34Z","links":{"resolver":"https://pith.science/pith/UJPN3N75EBWDYTO5ZSH3XHUXNH","bundle":"https://pith.science/pith/UJPN3N75EBWDYTO5ZSH3XHUXNH/bundle.json","state":"https://pith.science/pith/UJPN3N75EBWDYTO5ZSH3XHUXNH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UJPN3N75EBWDYTO5ZSH3XHUXNH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:UJPN3N75EBWDYTO5ZSH3XHUXNH","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":"d6940eb5d7d14bcfb82e4bd5fbb0d9688c562c7f4eb5ebd5fd16701f69a5b00e","cross_cats_sorted":["physics.acc-ph","physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2018-07-21T03:20:59Z","title_canon_sha256":"774197cb8585b374bbdd4c65a369a13e071b5048951514d6038bb1dab144dde9"},"schema_version":"1.0","source":{"id":"1807.08075","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.08075","created_at":"2026-05-17T23:49:22Z"},{"alias_kind":"arxiv_version","alias_value":"1807.08075v1","created_at":"2026-05-17T23:49:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.08075","created_at":"2026-05-17T23:49:22Z"},{"alias_kind":"pith_short_12","alias_value":"UJPN3N75EBWD","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_16","alias_value":"UJPN3N75EBWDYTO5","created_at":"2026-05-18T12:32:56Z"},{"alias_kind":"pith_short_8","alias_value":"UJPN3N75","created_at":"2026-05-18T12:32:56Z"}],"graph_snapshots":[{"event_id":"sha256:7cd7b2e533e12ab3fe434f739cafed23af39ecaba809f3a4102695c8330ba19a","target":"graph","created_at":"2026-05-17T23:49:22Z","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":"The substantial angular divergence of electron beams produced by direct laser acceleration is often considered as an inherent negative feature of the mechanism. The divergence however arises primarily because the standard approach relies on transverse electron oscillations and their interplay with the transverse electric fields of the laser pulse. We propose a conceptually different approach to direct laser acceleration that leverages longitudinal laser electric fields that are present in a tightly focused laser beam. A structured hollow-core target is used to enhance the longitudinal fields a","authors_text":"A. P. L. Robinson, A. V. Arefiev, X. Q. Yan, Z. Gong","cross_cats":["physics.acc-ph","physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2018-07-21T03:20:59Z","title":"Highly collimated electron acceleration by longitudinal laser fields in a hollow-core target"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.08075","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":"sha256:4cd3c4f7398c276bf6be3cf44e2d62bba16e78e50f8ed67139bedb576289e2dc","target":"record","created_at":"2026-05-17T23:49:22Z","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":"d6940eb5d7d14bcfb82e4bd5fbb0d9688c562c7f4eb5ebd5fd16701f69a5b00e","cross_cats_sorted":["physics.acc-ph","physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2018-07-21T03:20:59Z","title_canon_sha256":"774197cb8585b374bbdd4c65a369a13e071b5048951514d6038bb1dab144dde9"},"schema_version":"1.0","source":{"id":"1807.08075","kind":"arxiv","version":1}},"canonical_sha256":"a25eddb7fd206c3c4dddcc8fbb9e9769c9d6ee0daf2c21bf57bc9247efef8c7c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a25eddb7fd206c3c4dddcc8fbb9e9769c9d6ee0daf2c21bf57bc9247efef8c7c","first_computed_at":"2026-05-17T23:49:22.387659Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:49:22.387659Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"P7v6+66c7tyGFYoscCY3OZNznXzZCFh8Q3luAyez1z6RRHzrZtRNP6oJ1esQLVQ6MQLQacl/ZeUysNwWjoBRBA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:49:22.388238Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.08075","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4cd3c4f7398c276bf6be3cf44e2d62bba16e78e50f8ed67139bedb576289e2dc","sha256:7cd7b2e533e12ab3fe434f739cafed23af39ecaba809f3a4102695c8330ba19a"],"state_sha256":"d1cdfc306257bcdecbeab26d9957b5cab1483389b81caef4c84cef95394a9091"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CSQ85TZJTzccrN4xKdz49Eb7PLEGFXtgH5TtVnI50pcki5cY5quGhtLOCGP0/BuY80cUF6dfA6zxzljEoEKAAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T17:19:34.464914Z","bundle_sha256":"5f2fd17ee7e8d4cb9d36743448976e36d00087ad0c09a2c1e1220c630926e098"}}