{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:5E6BMWTIRJJWO4VM6UH5YUKXP7","short_pith_number":"pith:5E6BMWTI","canonical_record":{"source":{"id":"2502.12327","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2025-02-17T21:19:15Z","cross_cats_sorted":["cs.AI","cs.LG","cs.SY","eess.SY"],"title_canon_sha256":"6affbf34688a8d72987d7693fc63075bd74aa8bc077b67bce8071d63809256d7","abstract_canon_sha256":"3bde16c72e2f72eb0fa3f36e73794d152a428898bce6c4b63769ea45ad26ce56"},"schema_version":"1.0"},"canonical_sha256":"e93c165a688a536772acf50fdc51577fd06dfe8090f5e648c5ed9ea34421cb0d","source":{"kind":"arxiv","id":"2502.12327","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.12327","created_at":"2026-07-05T11:47:19Z"},{"alias_kind":"arxiv_version","alias_value":"2502.12327v2","created_at":"2026-07-05T11:47:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.12327","created_at":"2026-07-05T11:47:19Z"},{"alias_kind":"pith_short_12","alias_value":"5E6BMWTIRJJW","created_at":"2026-07-05T11:47:19Z"},{"alias_kind":"pith_short_16","alias_value":"5E6BMWTIRJJWO4VM","created_at":"2026-07-05T11:47:19Z"},{"alias_kind":"pith_short_8","alias_value":"5E6BMWTI","created_at":"2026-07-05T11:47:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:5E6BMWTIRJJWO4VM6UH5YUKXP7","target":"record","payload":{"canonical_record":{"source":{"id":"2502.12327","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2025-02-17T21:19:15Z","cross_cats_sorted":["cs.AI","cs.LG","cs.SY","eess.SY"],"title_canon_sha256":"6affbf34688a8d72987d7693fc63075bd74aa8bc077b67bce8071d63809256d7","abstract_canon_sha256":"3bde16c72e2f72eb0fa3f36e73794d152a428898bce6c4b63769ea45ad26ce56"},"schema_version":"1.0"},"canonical_sha256":"e93c165a688a536772acf50fdc51577fd06dfe8090f5e648c5ed9ea34421cb0d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:47:19.328354Z","signature_b64":"qsSV/M0I6U06nUwjh90crevW/9KoX31ACP2JwIR7ZgCQGHlDX3ANQflSD8Ivo89b+qCtYQ8XTxLKWSE56yBXAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e93c165a688a536772acf50fdc51577fd06dfe8090f5e648c5ed9ea34421cb0d","last_reissued_at":"2026-07-05T11:47:19.327839Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:47:19.327839Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2502.12327","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T11:47:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wVxzEvzGuoBi3MNa6wJkqieQ9RS9ZWJYyZ8+keSHBK3oe+wuXZs5CuU9+HM+DmDZiqe5U1naHAY2eVjpZAs2Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T03:30:45.966098Z"},"content_sha256":"1d2582464ae1448fada3ed35c3bacc5a963e166796da20a8acb6c4963bc9173e","schema_version":"1.0","event_id":"sha256:1d2582464ae1448fada3ed35c3bacc5a963e166796da20a8acb6c4963bc9173e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:5E6BMWTIRJJWO4VM6UH5YUKXP7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Learning Plasma Dynamics and Robust Rampdown Trajectories with Predict-First Experiments at TCV","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.AI","cs.LG","cs.SY","eess.SY"],"primary_cat":"physics.plasm-ph","authors_text":"Alessandro Pau, Allen M. Wang, Anna Vu, Antoine Merle, Charles Dawson, Chuchu Fan, Cristian Galperti, Cristina Rea, Cristina Venturini, Mark D. Boyer, Olivier Sauter, Oswin So, Stefano Marchioni, The TCV Team, Yoeri Poels","submitted_at":"2025-02-17T21:19:15Z","abstract_excerpt":"The rampdown phase of a tokamak pulse is difficult to simulate and often exacerbates multiple plasma instabilities. To reduce the risk of disrupting operations, we leverage advances in Scientific Machine Learning (SciML) to combine physics with data-driven models, developing a neural state-space model (NSSM) that predicts plasma dynamics during Tokamak \\`a Configuration Variable (TCV) rampdowns. The NSSM efficiently learns dynamics from a modest dataset of 311 pulses with only five pulses in a reactor-relevant high-performance regime. The NSSM is parallelized across uncertainties, and reinforc"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.12327","kind":"arxiv","version":2},"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/2502.12327/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":"2026-07-05T11:47:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VFF57zmc/2ZbpHN9cdsytNHU4gzaeXLDwsc3/6xrj9sOJFaPKP2mTZk4xOYzf0FvccYKQOOjMWY1Ogvi+UlLDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-08T03:30:45.966767Z"},"content_sha256":"87317c711c60c9b3d8f18185b09edeee044ac2f92052972deda76633862f4df2","schema_version":"1.0","event_id":"sha256:87317c711c60c9b3d8f18185b09edeee044ac2f92052972deda76633862f4df2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5E6BMWTIRJJWO4VM6UH5YUKXP7/bundle.json","state_url":"https://pith.science/pith/5E6BMWTIRJJWO4VM6UH5YUKXP7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5E6BMWTIRJJWO4VM6UH5YUKXP7/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":"2026-07-08T03:30:45Z","links":{"resolver":"https://pith.science/pith/5E6BMWTIRJJWO4VM6UH5YUKXP7","bundle":"https://pith.science/pith/5E6BMWTIRJJWO4VM6UH5YUKXP7/bundle.json","state":"https://pith.science/pith/5E6BMWTIRJJWO4VM6UH5YUKXP7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5E6BMWTIRJJWO4VM6UH5YUKXP7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:5E6BMWTIRJJWO4VM6UH5YUKXP7","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":"3bde16c72e2f72eb0fa3f36e73794d152a428898bce6c4b63769ea45ad26ce56","cross_cats_sorted":["cs.AI","cs.LG","cs.SY","eess.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2025-02-17T21:19:15Z","title_canon_sha256":"6affbf34688a8d72987d7693fc63075bd74aa8bc077b67bce8071d63809256d7"},"schema_version":"1.0","source":{"id":"2502.12327","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2502.12327","created_at":"2026-07-05T11:47:19Z"},{"alias_kind":"arxiv_version","alias_value":"2502.12327v2","created_at":"2026-07-05T11:47:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2502.12327","created_at":"2026-07-05T11:47:19Z"},{"alias_kind":"pith_short_12","alias_value":"5E6BMWTIRJJW","created_at":"2026-07-05T11:47:19Z"},{"alias_kind":"pith_short_16","alias_value":"5E6BMWTIRJJWO4VM","created_at":"2026-07-05T11:47:19Z"},{"alias_kind":"pith_short_8","alias_value":"5E6BMWTI","created_at":"2026-07-05T11:47:19Z"}],"graph_snapshots":[{"event_id":"sha256:87317c711c60c9b3d8f18185b09edeee044ac2f92052972deda76633862f4df2","target":"graph","created_at":"2026-07-05T11:47:19Z","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/2502.12327/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The rampdown phase of a tokamak pulse is difficult to simulate and often exacerbates multiple plasma instabilities. To reduce the risk of disrupting operations, we leverage advances in Scientific Machine Learning (SciML) to combine physics with data-driven models, developing a neural state-space model (NSSM) that predicts plasma dynamics during Tokamak \\`a Configuration Variable (TCV) rampdowns. The NSSM efficiently learns dynamics from a modest dataset of 311 pulses with only five pulses in a reactor-relevant high-performance regime. The NSSM is parallelized across uncertainties, and reinforc","authors_text":"Alessandro Pau, Allen M. Wang, Anna Vu, Antoine Merle, Charles Dawson, Chuchu Fan, Cristian Galperti, Cristina Rea, Cristina Venturini, Mark D. Boyer, Olivier Sauter, Oswin So, Stefano Marchioni, The TCV Team, Yoeri Poels","cross_cats":["cs.AI","cs.LG","cs.SY","eess.SY"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2025-02-17T21:19:15Z","title":"Learning Plasma Dynamics and Robust Rampdown Trajectories with Predict-First Experiments at TCV"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2502.12327","kind":"arxiv","version":2},"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":"sha256:1d2582464ae1448fada3ed35c3bacc5a963e166796da20a8acb6c4963bc9173e","target":"record","created_at":"2026-07-05T11:47:19Z","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":"3bde16c72e2f72eb0fa3f36e73794d152a428898bce6c4b63769ea45ad26ce56","cross_cats_sorted":["cs.AI","cs.LG","cs.SY","eess.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2025-02-17T21:19:15Z","title_canon_sha256":"6affbf34688a8d72987d7693fc63075bd74aa8bc077b67bce8071d63809256d7"},"schema_version":"1.0","source":{"id":"2502.12327","kind":"arxiv","version":2}},"canonical_sha256":"e93c165a688a536772acf50fdc51577fd06dfe8090f5e648c5ed9ea34421cb0d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e93c165a688a536772acf50fdc51577fd06dfe8090f5e648c5ed9ea34421cb0d","first_computed_at":"2026-07-05T11:47:19.327839Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:47:19.327839Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"qsSV/M0I6U06nUwjh90crevW/9KoX31ACP2JwIR7ZgCQGHlDX3ANQflSD8Ivo89b+qCtYQ8XTxLKWSE56yBXAA==","signature_status":"signed_v1","signed_at":"2026-07-05T11:47:19.328354Z","signed_message":"canonical_sha256_bytes"},"source_id":"2502.12327","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1d2582464ae1448fada3ed35c3bacc5a963e166796da20a8acb6c4963bc9173e","sha256:87317c711c60c9b3d8f18185b09edeee044ac2f92052972deda76633862f4df2"],"state_sha256":"6672914cc48907a0b94fa2d85c463b86705d704947e7ee53960ebd18adc64da6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GaglP1TpF49luMpZd8t4Be7+qdjQRpCxlpV6Od8J3Jfv0p60bBUU4YLJputakjf+FDiifa5zDnx2lD93eUwsDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-08T03:30:45.970195Z","bundle_sha256":"b4d767325e36d13a6c9c3a34d370414eebcacba4e9ff3f0b79d054ba5a02fa2f"}}