{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:6RCEZFYH7OZXRKBM73AEHNFWEM","short_pith_number":"pith:6RCEZFYH","canonical_record":{"source":{"id":"1506.08430","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2015-06-28T17:36:31Z","cross_cats_sorted":[],"title_canon_sha256":"750e2b625a2bc97112f00552ae42657e3ebabcd63acb330bde5d00abc111df98","abstract_canon_sha256":"1dc664d8befb9dccc6bca9de1a20fd16765b5725f56c37b006e32b751224b181"},"schema_version":"1.0"},"canonical_sha256":"f4444c9707fbb378a82cfec043b4b62301d5dde9d8fb959ed077f503b4bbd256","source":{"kind":"arxiv","id":"1506.08430","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.08430","created_at":"2026-05-18T01:37:45Z"},{"alias_kind":"arxiv_version","alias_value":"1506.08430v1","created_at":"2026-05-18T01:37:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.08430","created_at":"2026-05-18T01:37:45Z"},{"alias_kind":"pith_short_12","alias_value":"6RCEZFYH7OZX","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_16","alias_value":"6RCEZFYH7OZXRKBM","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_8","alias_value":"6RCEZFYH","created_at":"2026-05-18T12:29:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:6RCEZFYH7OZXRKBM73AEHNFWEM","target":"record","payload":{"canonical_record":{"source":{"id":"1506.08430","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2015-06-28T17:36:31Z","cross_cats_sorted":[],"title_canon_sha256":"750e2b625a2bc97112f00552ae42657e3ebabcd63acb330bde5d00abc111df98","abstract_canon_sha256":"1dc664d8befb9dccc6bca9de1a20fd16765b5725f56c37b006e32b751224b181"},"schema_version":"1.0"},"canonical_sha256":"f4444c9707fbb378a82cfec043b4b62301d5dde9d8fb959ed077f503b4bbd256","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:37:45.329321Z","signature_b64":"2K3phzG+pS47IWGTWRiKgXCuuN8fhsUFZYlP4wwlcTk+9MDcv07m6CO+LWU/QUMO9efZAjEiEbKVbteIdFO7Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f4444c9707fbb378a82cfec043b4b62301d5dde9d8fb959ed077f503b4bbd256","last_reissued_at":"2026-05-18T01:37:45.328855Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:37:45.328855Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1506.08430","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":"2026-05-18T01:37:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FQX2DmAnciOab8XhXRLqx6Fc5CG6QJTbq9it3GwOzLkKjeYQb0nV6hX4+d46F7j1RtXhqD5MCAlYBECEVfMfDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-12T06:50:20.040341Z"},"content_sha256":"8335a06ecb0fb56c50734369af46a71d8379742f631061ea5d531105f56d6832","schema_version":"1.0","event_id":"sha256:8335a06ecb0fb56c50734369af46a71d8379742f631061ea5d531105f56d6832"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:6RCEZFYH7OZXRKBM73AEHNFWEM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Enhancing proton acceleration by using composite targets","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.plasm-ph","authors_text":"C. B. Schroeder, E. Esarey, F. Pegoraro, M. Kando, S. S. Bulanov, S. V. Bulanov, T. Zh. Esirkepov, W. P. Leemans","submitted_at":"2015-06-28T17:36:31Z","abstract_excerpt":"Efficient laser ion acceleration requires high laser intensities, which can only be obtained by tightly focusing laser radiation. In the radiation pressure acceleration regime, where the tightly focused laser driver leads to the appearance of the fundamental limit for the maximum attainable ion energy, this limit corresponds to the laser pulse group velocity as well as to another limit connected with the transverse expansion of the accelerated foil and consequent onset of the foil transparency. These limits can be relaxed by using composite targets, consisting of a thin foil followed by a near"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.08430","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":"2026-05-18T01:37:45Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9+YE4ryPqf3TAB1iQKOvknucGYbVJQhGHWIKc9dJGgNn/j1fvm07TMwROiWluUgCg6Qs7PHvupslnHhSTkroDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-12T06:50:20.040967Z"},"content_sha256":"c3e939cb24157ce8608cf0a54cc10713f72bc647d6aee481399ac78b6ea1d93b","schema_version":"1.0","event_id":"sha256:c3e939cb24157ce8608cf0a54cc10713f72bc647d6aee481399ac78b6ea1d93b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6RCEZFYH7OZXRKBM73AEHNFWEM/bundle.json","state_url":"https://pith.science/pith/6RCEZFYH7OZXRKBM73AEHNFWEM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6RCEZFYH7OZXRKBM73AEHNFWEM/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":"2026-06-12T06:50:20Z","links":{"resolver":"https://pith.science/pith/6RCEZFYH7OZXRKBM73AEHNFWEM","bundle":"https://pith.science/pith/6RCEZFYH7OZXRKBM73AEHNFWEM/bundle.json","state":"https://pith.science/pith/6RCEZFYH7OZXRKBM73AEHNFWEM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6RCEZFYH7OZXRKBM73AEHNFWEM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:6RCEZFYH7OZXRKBM73AEHNFWEM","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":"1dc664d8befb9dccc6bca9de1a20fd16765b5725f56c37b006e32b751224b181","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2015-06-28T17:36:31Z","title_canon_sha256":"750e2b625a2bc97112f00552ae42657e3ebabcd63acb330bde5d00abc111df98"},"schema_version":"1.0","source":{"id":"1506.08430","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.08430","created_at":"2026-05-18T01:37:45Z"},{"alias_kind":"arxiv_version","alias_value":"1506.08430v1","created_at":"2026-05-18T01:37:45Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.08430","created_at":"2026-05-18T01:37:45Z"},{"alias_kind":"pith_short_12","alias_value":"6RCEZFYH7OZX","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_16","alias_value":"6RCEZFYH7OZXRKBM","created_at":"2026-05-18T12:29:07Z"},{"alias_kind":"pith_short_8","alias_value":"6RCEZFYH","created_at":"2026-05-18T12:29:07Z"}],"graph_snapshots":[{"event_id":"sha256:c3e939cb24157ce8608cf0a54cc10713f72bc647d6aee481399ac78b6ea1d93b","target":"graph","created_at":"2026-05-18T01:37:45Z","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":"Efficient laser ion acceleration requires high laser intensities, which can only be obtained by tightly focusing laser radiation. In the radiation pressure acceleration regime, where the tightly focused laser driver leads to the appearance of the fundamental limit for the maximum attainable ion energy, this limit corresponds to the laser pulse group velocity as well as to another limit connected with the transverse expansion of the accelerated foil and consequent onset of the foil transparency. These limits can be relaxed by using composite targets, consisting of a thin foil followed by a near","authors_text":"C. B. Schroeder, E. Esarey, F. Pegoraro, M. Kando, S. S. Bulanov, S. V. Bulanov, T. Zh. Esirkepov, W. P. Leemans","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2015-06-28T17:36:31Z","title":"Enhancing proton acceleration by using composite targets"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.08430","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":"sha256:8335a06ecb0fb56c50734369af46a71d8379742f631061ea5d531105f56d6832","target":"record","created_at":"2026-05-18T01:37:45Z","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":"1dc664d8befb9dccc6bca9de1a20fd16765b5725f56c37b006e32b751224b181","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2015-06-28T17:36:31Z","title_canon_sha256":"750e2b625a2bc97112f00552ae42657e3ebabcd63acb330bde5d00abc111df98"},"schema_version":"1.0","source":{"id":"1506.08430","kind":"arxiv","version":1}},"canonical_sha256":"f4444c9707fbb378a82cfec043b4b62301d5dde9d8fb959ed077f503b4bbd256","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f4444c9707fbb378a82cfec043b4b62301d5dde9d8fb959ed077f503b4bbd256","first_computed_at":"2026-05-18T01:37:45.328855Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:37:45.328855Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2K3phzG+pS47IWGTWRiKgXCuuN8fhsUFZYlP4wwlcTk+9MDcv07m6CO+LWU/QUMO9efZAjEiEbKVbteIdFO7Dg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:37:45.329321Z","signed_message":"canonical_sha256_bytes"},"source_id":"1506.08430","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8335a06ecb0fb56c50734369af46a71d8379742f631061ea5d531105f56d6832","sha256:c3e939cb24157ce8608cf0a54cc10713f72bc647d6aee481399ac78b6ea1d93b"],"state_sha256":"1b074ad52f82e0ab88d67aaa16d8068752f6d9ca0ae28d3fb443ff0bda9d34fb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Szz+l25C9xQunTGnuRofzB0sPcA6WRJnlnB0bqO3wWDx9sBDD+VDIoKKFpN4wicEhsqxVo4GH7Hg5K2ZSuRfCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-12T06:50:20.043886Z","bundle_sha256":"d812bc7dba2bdce70f1f36a59d2a7921834d58426491a086460a1f0c53bc0e74"}}