{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:LKO3UR6R5ZAQWEANJR23NVJTML","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":"182f1427d7bc686869687a5cb970c3c87e44ab40dbe1f0318c2f73c0dfec1884","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2012-09-10T16:28:05Z","title_canon_sha256":"7316b6bc9632aae04fdf26171e65ce425656cac4647e01cca94d13c0b3c6f250"},"schema_version":"1.0","source":{"id":"1209.2054","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.2054","created_at":"2026-05-18T03:45:53Z"},{"alias_kind":"arxiv_version","alias_value":"1209.2054v1","created_at":"2026-05-18T03:45:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.2054","created_at":"2026-05-18T03:45:53Z"},{"alias_kind":"pith_short_12","alias_value":"LKO3UR6R5ZAQ","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_16","alias_value":"LKO3UR6R5ZAQWEAN","created_at":"2026-05-18T12:27:14Z"},{"alias_kind":"pith_short_8","alias_value":"LKO3UR6R","created_at":"2026-05-18T12:27:14Z"}],"graph_snapshots":[{"event_id":"sha256:37483bbfb8479f00ede7330b10fb138969c439d0ecedd20b057e70118a28e282","target":"graph","created_at":"2026-05-18T03:45:53Z","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":"Challenging aspects of large-scale turbulent edge simulations in plasma physics include robust nonlinear solvers and efficient preconditioners. This paper presents recent advances in the scalable solution of nonlinear partial differential equations in BOUT++, with emphasis on simulations of edge localized modes in tokamaks. A six-field, nonlinear, reduced magnetohydrodynamics model containing the fast shear Alfven wave and electron and ion heat conduction along magnetic fields is solved by using Jacobian-free Newton-Krylov (JFNK) methods and nonlinear GMRES (NGMRES). Physics-based precondition","authors_text":"Ben Dudson, Lois Curfman McInnes, Sean Farley","cross_cats":["physics.comp-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2012-09-10T16:28:05Z","title":"Improved Nonlinear Solvers in BOUT++"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.2054","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":"sha256:0e70d54ed4330b621067fa1c7a4775c8d22853b3ac0f57a2b65f8d52ab752ab7","target":"record","created_at":"2026-05-18T03:45:53Z","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":"182f1427d7bc686869687a5cb970c3c87e44ab40dbe1f0318c2f73c0dfec1884","cross_cats_sorted":["physics.comp-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2012-09-10T16:28:05Z","title_canon_sha256":"7316b6bc9632aae04fdf26171e65ce425656cac4647e01cca94d13c0b3c6f250"},"schema_version":"1.0","source":{"id":"1209.2054","kind":"arxiv","version":1}},"canonical_sha256":"5a9dba47d1ee410b100d4c75b6d53362cf82bf8b59310c61913392a9864db278","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5a9dba47d1ee410b100d4c75b6d53362cf82bf8b59310c61913392a9864db278","first_computed_at":"2026-05-18T03:45:53.838394Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:45:53.838394Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZNRrLwI2aSaacaennrjW/y7d3zW4Soto3b/oZWUmsVfzV9jRtWjLcInBmBm7RldGooihcPVVUl+RzG5LV3TCCg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:45:53.838828Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.2054","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0e70d54ed4330b621067fa1c7a4775c8d22853b3ac0f57a2b65f8d52ab752ab7","sha256:37483bbfb8479f00ede7330b10fb138969c439d0ecedd20b057e70118a28e282"],"state_sha256":"b6b815dc9d9689630cea8ae75069a4aa1b3ed1c1f2f962e606974053f3273445"}