{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:EP3ALSINAPOGYBGVCOBVD3TOWI","short_pith_number":"pith:EP3ALSIN","canonical_record":{"source":{"id":"2606.23224","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2026-06-22T12:11:32Z","cross_cats_sorted":[],"title_canon_sha256":"4a07b7a0f3d3226b058d1f4c461465a4b5d4117239bcab14048d01917038c782","abstract_canon_sha256":"cf734aedb98a95fbd915ab5b3d660dce26fe07dd883fdb516d3784e89a380d18"},"schema_version":"1.0"},"canonical_sha256":"23f605c90d03dc6c04d5138351ee6eb21e26423adf20ebe42665f1edb6129ec5","source":{"kind":"arxiv","id":"2606.23224","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.23224","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"arxiv_version","alias_value":"2606.23224v1","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.23224","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"pith_short_12","alias_value":"EP3ALSINAPOG","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"pith_short_16","alias_value":"EP3ALSINAPOGYBGV","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"pith_short_8","alias_value":"EP3ALSIN","created_at":"2026-06-23T03:14:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:EP3ALSINAPOGYBGVCOBVD3TOWI","target":"record","payload":{"canonical_record":{"source":{"id":"2606.23224","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2026-06-22T12:11:32Z","cross_cats_sorted":[],"title_canon_sha256":"4a07b7a0f3d3226b058d1f4c461465a4b5d4117239bcab14048d01917038c782","abstract_canon_sha256":"cf734aedb98a95fbd915ab5b3d660dce26fe07dd883fdb516d3784e89a380d18"},"schema_version":"1.0"},"canonical_sha256":"23f605c90d03dc6c04d5138351ee6eb21e26423adf20ebe42665f1edb6129ec5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-23T03:14:14.250488Z","signature_b64":"PeTMaEJvvbBMGgpzTef2PQzxqiG1WIsjrSQWJyuTc9GMtNrQeoQI9GsrjWhG5e4xFN6ZvI2NubrdbAeFgQiXDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"23f605c90d03dc6c04d5138351ee6eb21e26423adf20ebe42665f1edb6129ec5","last_reissued_at":"2026-06-23T03:14:14.250048Z","signature_status":"signed_v1","first_computed_at":"2026-06-23T03:14:14.250048Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.23224","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":"2026-06-23T03:14:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"n+Y5WyZujEJWym8rhPnYWrfOBqYO9XZv8MXZE9Rn6jy8W5+8DnjbNgtY+JsD4fq3clem3WNvJd42A12ds5GeDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-04T05:29:54.636144Z"},"content_sha256":"727207f0ca50e21c8de080ac3787035a9e5e10ba0b5e439b26a0238ed1712765","schema_version":"1.0","event_id":"sha256:727207f0ca50e21c8de080ac3787035a9e5e10ba0b5e439b26a0238ed1712765"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:EP3ALSINAPOGYBGVCOBVD3TOWI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Multi-objective Bayesian optimisation of a double-layer target for quasi-monoenergetic TNSA protons","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.plasm-ph","authors_text":"Bai-Song Xie, Chengqi-Zhang, Mamat Ali Bake, Yang He","submitted_at":"2026-06-22T12:11:32Z","abstract_excerpt":"We carry out a six-parameter multi-objective Bayesian optimisation of a carbon--hydrogen double-layer target for target-normal-sheath proton acceleration. The campaign consists of 80 two-dimensional EPOCH simulations with the laser amplitude $a_0$, pulse duration $\\tau$, carbon-layer thickness $L_1$, hydrogen-layer density $N_2$, hydrogen-layer thickness $L_2$ and hydrogen-layer radius $r_p$ as input variables. Each final proton spectrum is scored by the peak energy, the charge fraction inside a $\\pm10\\%$ peak-energy window and the charge in that window. Among the Pareto-set evaluations, the c"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.23224","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/2606.23224/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":"2026-06-23T03:14:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DiKL0F00mIpuiBFyDsj4rHAj/DOq7NzGrC7Zc3HWuwe6jkRxrOjEmicTevOgj78gxPic+ooGHZSM6uFhq6K3Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-04T05:29:54.636552Z"},"content_sha256":"5ebece3346e82a359ffa64290c51916429be79910ea9ce73d0b6daffb80edfdd","schema_version":"1.0","event_id":"sha256:5ebece3346e82a359ffa64290c51916429be79910ea9ce73d0b6daffb80edfdd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EP3ALSINAPOGYBGVCOBVD3TOWI/bundle.json","state_url":"https://pith.science/pith/EP3ALSINAPOGYBGVCOBVD3TOWI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EP3ALSINAPOGYBGVCOBVD3TOWI/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":"2026-07-04T05:29:54Z","links":{"resolver":"https://pith.science/pith/EP3ALSINAPOGYBGVCOBVD3TOWI","bundle":"https://pith.science/pith/EP3ALSINAPOGYBGVCOBVD3TOWI/bundle.json","state":"https://pith.science/pith/EP3ALSINAPOGYBGVCOBVD3TOWI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EP3ALSINAPOGYBGVCOBVD3TOWI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:EP3ALSINAPOGYBGVCOBVD3TOWI","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":"cf734aedb98a95fbd915ab5b3d660dce26fe07dd883fdb516d3784e89a380d18","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2026-06-22T12:11:32Z","title_canon_sha256":"4a07b7a0f3d3226b058d1f4c461465a4b5d4117239bcab14048d01917038c782"},"schema_version":"1.0","source":{"id":"2606.23224","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.23224","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"arxiv_version","alias_value":"2606.23224v1","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.23224","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"pith_short_12","alias_value":"EP3ALSINAPOG","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"pith_short_16","alias_value":"EP3ALSINAPOGYBGV","created_at":"2026-06-23T03:14:14Z"},{"alias_kind":"pith_short_8","alias_value":"EP3ALSIN","created_at":"2026-06-23T03:14:14Z"}],"graph_snapshots":[{"event_id":"sha256:5ebece3346e82a359ffa64290c51916429be79910ea9ce73d0b6daffb80edfdd","target":"graph","created_at":"2026-06-23T03:14:14Z","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/2606.23224/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We carry out a six-parameter multi-objective Bayesian optimisation of a carbon--hydrogen double-layer target for target-normal-sheath proton acceleration. The campaign consists of 80 two-dimensional EPOCH simulations with the laser amplitude $a_0$, pulse duration $\\tau$, carbon-layer thickness $L_1$, hydrogen-layer density $N_2$, hydrogen-layer thickness $L_2$ and hydrogen-layer radius $r_p$ as input variables. Each final proton spectrum is scored by the peak energy, the charge fraction inside a $\\pm10\\%$ peak-energy window and the charge in that window. Among the Pareto-set evaluations, the c","authors_text":"Bai-Song Xie, Chengqi-Zhang, Mamat Ali Bake, Yang He","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2026-06-22T12:11:32Z","title":"Multi-objective Bayesian optimisation of a double-layer target for quasi-monoenergetic TNSA protons"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.23224","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":"sha256:727207f0ca50e21c8de080ac3787035a9e5e10ba0b5e439b26a0238ed1712765","target":"record","created_at":"2026-06-23T03:14:14Z","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":"cf734aedb98a95fbd915ab5b3d660dce26fe07dd883fdb516d3784e89a380d18","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2026-06-22T12:11:32Z","title_canon_sha256":"4a07b7a0f3d3226b058d1f4c461465a4b5d4117239bcab14048d01917038c782"},"schema_version":"1.0","source":{"id":"2606.23224","kind":"arxiv","version":1}},"canonical_sha256":"23f605c90d03dc6c04d5138351ee6eb21e26423adf20ebe42665f1edb6129ec5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"23f605c90d03dc6c04d5138351ee6eb21e26423adf20ebe42665f1edb6129ec5","first_computed_at":"2026-06-23T03:14:14.250048Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-23T03:14:14.250048Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"PeTMaEJvvbBMGgpzTef2PQzxqiG1WIsjrSQWJyuTc9GMtNrQeoQI9GsrjWhG5e4xFN6ZvI2NubrdbAeFgQiXDw==","signature_status":"signed_v1","signed_at":"2026-06-23T03:14:14.250488Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.23224","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:727207f0ca50e21c8de080ac3787035a9e5e10ba0b5e439b26a0238ed1712765","sha256:5ebece3346e82a359ffa64290c51916429be79910ea9ce73d0b6daffb80edfdd"],"state_sha256":"a0e6523fbd1b5d08e9acbaaecf3d6e4dae0085905859829723d11dd78a3a2d78"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"fOr3ihxfwEDUh6c/tWNNqP7yL6k8FXiy12Il4gBFdWsr6+UdJ6no8Wal+i1MF98MpRAx84LO5mjEqMxKM1r8Dw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-04T05:29:54.638669Z","bundle_sha256":"d920c73d97a4cbe5b07f4094f5133705736b541d2658eb654c9ca867852b5058"}}