{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:MCUA42KND4KXMAUYDFXSUJ4G2F","short_pith_number":"pith:MCUA42KN","canonical_record":{"source":{"id":"2605.20647","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-20T03:09:25Z","cross_cats_sorted":["physics.plasm-ph"],"title_canon_sha256":"0ffa317145115d381a58bed633e555c3429874efd60354f17d1bf8af50b39c17","abstract_canon_sha256":"08d288f93fe0e5272dc5db38e2c9401a6a9b13b29c891412f444924cd4fad255"},"schema_version":"1.0"},"canonical_sha256":"60a80e694d1f15760298196f2a2786d168a2217828f60b0c123f6975bd0a9136","source":{"kind":"arxiv","id":"2605.20647","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.20647","created_at":"2026-05-21T01:04:46Z"},{"alias_kind":"arxiv_version","alias_value":"2605.20647v1","created_at":"2026-05-21T01:04:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.20647","created_at":"2026-05-21T01:04:46Z"},{"alias_kind":"pith_short_12","alias_value":"MCUA42KND4KX","created_at":"2026-05-21T01:04:46Z"},{"alias_kind":"pith_short_16","alias_value":"MCUA42KND4KXMAUY","created_at":"2026-05-21T01:04:46Z"},{"alias_kind":"pith_short_8","alias_value":"MCUA42KN","created_at":"2026-05-21T01:04:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:MCUA42KND4KXMAUYDFXSUJ4G2F","target":"record","payload":{"canonical_record":{"source":{"id":"2605.20647","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-20T03:09:25Z","cross_cats_sorted":["physics.plasm-ph"],"title_canon_sha256":"0ffa317145115d381a58bed633e555c3429874efd60354f17d1bf8af50b39c17","abstract_canon_sha256":"08d288f93fe0e5272dc5db38e2c9401a6a9b13b29c891412f444924cd4fad255"},"schema_version":"1.0"},"canonical_sha256":"60a80e694d1f15760298196f2a2786d168a2217828f60b0c123f6975bd0a9136","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-21T01:04:46.825410Z","signature_b64":"y0Yp3sdcWFqfX/+DxaAd+DfwTYgbIWENurtA2uAb0pMLLwEpIeBZq//XiRfzuhuJQOtrzsT5x96vSWAYXQOiDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"60a80e694d1f15760298196f2a2786d168a2217828f60b0c123f6975bd0a9136","last_reissued_at":"2026-05-21T01:04:46.824716Z","signature_status":"signed_v1","first_computed_at":"2026-05-21T01:04:46.824716Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.20647","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":"2026-05-21T01:04:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v6KZf99KP++MU8I2w6BLwcglk61x14v/9tximPxwFxUpxrPJ+7JPojfsGKRc6xgLn5Cs3tR+j8RkArUTsqmkDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T17:06:49.708375Z"},"content_sha256":"ee1aca08ba202a4f65b9d4a2f2a3505bafc5a4fa81b085aea5bb0175036365e9","schema_version":"1.0","event_id":"sha256:ee1aca08ba202a4f65b9d4a2f2a3505bafc5a4fa81b085aea5bb0175036365e9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:MCUA42KND4KXMAUYDFXSUJ4G2F","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"HotLoop Optimization of Petawatt Laser Focal Spot via a Twin-Focus Scheme","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["physics.plasm-ph"],"primary_cat":"physics.optics","authors_text":"Chenghao Hua, Chen Lin, Haoran Chen, Jiarui Zhao, Ke Chen, Liyong Ma, Minjian Wu, Pengcheng Fan, Qihang Han, Qingfan Wu, Shengxuan Xu, Shirui Xu, Shiyou Chen, Tan Song, Tianhao Liang, Tianqi Xu, Wenjun Ma, Xueqing Yan, Yanying Zhao, Yifei Shen, Ying Gao, Yixing Geng, Yujia Zhang, Yuntian Xie, Zhangyi Wu, Zhongshuai Zhang, Zhuo Pan, Ziyang Peng","submitted_at":"2026-05-20T03:09:25Z","abstract_excerpt":"Achieving diffraction-limited focusing of high-power laser pulses to generate ultra-high intensities is crucial for developing compact laser-driven particle accelerators and exploring strong-field quantum electrodynamics. However, accurately diagnosing and optimizing the focal spots of petawatt (PW) laser pulses remains a significant challenge. In this work, we present an experimental methodology utilizing a twin-focus scheme to precisely characterize the intensity distribution and wavefront of focused PW femtosecond laser pulses, and employ it to elucidate their power-dependent evolution. Fur"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.20647","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/2605.20647/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":"2026-05-21T01:04:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZoobJjh+d+gE3lktus1wMT/aHUBLtOC1UeKvXUzmuBf8kj2JEH25Hxjt+wqUvnwa7rWKrWsSe9/cZJv1YxL7Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T17:06:49.709085Z"},"content_sha256":"5824712a4443560610c686650d8c87fc3680c1b618b11739d1baa528bb962a0d","schema_version":"1.0","event_id":"sha256:5824712a4443560610c686650d8c87fc3680c1b618b11739d1baa528bb962a0d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MCUA42KND4KXMAUYDFXSUJ4G2F/bundle.json","state_url":"https://pith.science/pith/MCUA42KND4KXMAUYDFXSUJ4G2F/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MCUA42KND4KXMAUYDFXSUJ4G2F/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":"2026-05-28T17:06:49Z","links":{"resolver":"https://pith.science/pith/MCUA42KND4KXMAUYDFXSUJ4G2F","bundle":"https://pith.science/pith/MCUA42KND4KXMAUYDFXSUJ4G2F/bundle.json","state":"https://pith.science/pith/MCUA42KND4KXMAUYDFXSUJ4G2F/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MCUA42KND4KXMAUYDFXSUJ4G2F/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:MCUA42KND4KXMAUYDFXSUJ4G2F","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":"08d288f93fe0e5272dc5db38e2c9401a6a9b13b29c891412f444924cd4fad255","cross_cats_sorted":["physics.plasm-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-20T03:09:25Z","title_canon_sha256":"0ffa317145115d381a58bed633e555c3429874efd60354f17d1bf8af50b39c17"},"schema_version":"1.0","source":{"id":"2605.20647","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.20647","created_at":"2026-05-21T01:04:46Z"},{"alias_kind":"arxiv_version","alias_value":"2605.20647v1","created_at":"2026-05-21T01:04:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.20647","created_at":"2026-05-21T01:04:46Z"},{"alias_kind":"pith_short_12","alias_value":"MCUA42KND4KX","created_at":"2026-05-21T01:04:46Z"},{"alias_kind":"pith_short_16","alias_value":"MCUA42KND4KXMAUY","created_at":"2026-05-21T01:04:46Z"},{"alias_kind":"pith_short_8","alias_value":"MCUA42KN","created_at":"2026-05-21T01:04:46Z"}],"graph_snapshots":[{"event_id":"sha256:5824712a4443560610c686650d8c87fc3680c1b618b11739d1baa528bb962a0d","target":"graph","created_at":"2026-05-21T01:04:46Z","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/2605.20647/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Achieving diffraction-limited focusing of high-power laser pulses to generate ultra-high intensities is crucial for developing compact laser-driven particle accelerators and exploring strong-field quantum electrodynamics. However, accurately diagnosing and optimizing the focal spots of petawatt (PW) laser pulses remains a significant challenge. In this work, we present an experimental methodology utilizing a twin-focus scheme to precisely characterize the intensity distribution and wavefront of focused PW femtosecond laser pulses, and employ it to elucidate their power-dependent evolution. Fur","authors_text":"Chenghao Hua, Chen Lin, Haoran Chen, Jiarui Zhao, Ke Chen, Liyong Ma, Minjian Wu, Pengcheng Fan, Qihang Han, Qingfan Wu, Shengxuan Xu, Shirui Xu, Shiyou Chen, Tan Song, Tianhao Liang, Tianqi Xu, Wenjun Ma, Xueqing Yan, Yanying Zhao, Yifei Shen, Ying Gao, Yixing Geng, Yujia Zhang, Yuntian Xie, Zhangyi Wu, Zhongshuai Zhang, Zhuo Pan, Ziyang Peng","cross_cats":["physics.plasm-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-20T03:09:25Z","title":"HotLoop Optimization of Petawatt Laser Focal Spot via a Twin-Focus Scheme"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.20647","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:ee1aca08ba202a4f65b9d4a2f2a3505bafc5a4fa81b085aea5bb0175036365e9","target":"record","created_at":"2026-05-21T01:04:46Z","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":"08d288f93fe0e5272dc5db38e2c9401a6a9b13b29c891412f444924cd4fad255","cross_cats_sorted":["physics.plasm-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.optics","submitted_at":"2026-05-20T03:09:25Z","title_canon_sha256":"0ffa317145115d381a58bed633e555c3429874efd60354f17d1bf8af50b39c17"},"schema_version":"1.0","source":{"id":"2605.20647","kind":"arxiv","version":1}},"canonical_sha256":"60a80e694d1f15760298196f2a2786d168a2217828f60b0c123f6975bd0a9136","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"60a80e694d1f15760298196f2a2786d168a2217828f60b0c123f6975bd0a9136","first_computed_at":"2026-05-21T01:04:46.824716Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-21T01:04:46.824716Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"y0Yp3sdcWFqfX/+DxaAd+DfwTYgbIWENurtA2uAb0pMLLwEpIeBZq//XiRfzuhuJQOtrzsT5x96vSWAYXQOiDQ==","signature_status":"signed_v1","signed_at":"2026-05-21T01:04:46.825410Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.20647","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ee1aca08ba202a4f65b9d4a2f2a3505bafc5a4fa81b085aea5bb0175036365e9","sha256:5824712a4443560610c686650d8c87fc3680c1b618b11739d1baa528bb962a0d"],"state_sha256":"81907eada70fab95c6a6c36a6752322037fcff3e5b5db13781906cb57541d85a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AohqBo9WKMxQ2IolS3QqejqIzq7ehK8iyovMH83xjiFNcYK+EDMYRbGMHqQNK2UeaQXrxD/74AlUNkLOW5HwCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T17:06:49.712880Z","bundle_sha256":"bf7aefcfc94de30867af520b0cad104c5cf6097433cb274b549311dfc91b813b"}}