{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:DB6ZKZATB3E4B42IWKPZUKSZ5T","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":"34d7944aef735a79605571eb91d8faa0534d6a92b7f92468a3505b14ca42e7af","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2011-08-19T17:33:03Z","title_canon_sha256":"2814262ce13086c20fc41e69e586187059510d3eb438c690206cfbc7e49afc83"},"schema_version":"1.0","source":{"id":"1108.4015","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.4015","created_at":"2026-05-18T02:00:50Z"},{"alias_kind":"arxiv_version","alias_value":"1108.4015v3","created_at":"2026-05-18T02:00:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.4015","created_at":"2026-05-18T02:00:50Z"},{"alias_kind":"pith_short_12","alias_value":"DB6ZKZATB3E4","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_16","alias_value":"DB6ZKZATB3E4B42I","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_8","alias_value":"DB6ZKZAT","created_at":"2026-05-18T12:26:26Z"}],"graph_snapshots":[{"event_id":"sha256:416744da5c99a3ecdb3cb968b44356295e5a45b084e1a021f09b958761d83211","target":"graph","created_at":"2026-05-18T02:00:50Z","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":"We have developed and demonstrated a versatile, compact electron source that can produce a monoenergetic electron beam up to 50 mm diameter from 0.1 to 30 keV with an energy spread of <10 eV. By illuminating a metal cathode plate with a single near ultraviolet (UV) light emitting diode (LED), a spatially uniform electron beam with 15% variation over 1 cm2 can be generated. A uniform electric field in front of the cathode surface accelerates the electrons into a beam with an angular divergence of <1 degree at 1 keV. The beam intensity can be controlled from 10^9 electrons/cm2s.","authors_text":"Elizabeth MacDonald, Herb Funsten, Kevin Henderson, Ron Harper","cross_cats":["physics.ins-det"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2011-08-19T17:33:03Z","title":"Ultraviolet stimulated electron source for use with low energy plasma instrument calibration"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.4015","kind":"arxiv","version":3},"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":"sha256:96c7e40b2b8a25140eb80b63109b0d14f6985c0d9b1f3ff4424fee29f7f2068c","target":"record","created_at":"2026-05-18T02:00:50Z","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":"34d7944aef735a79605571eb91d8faa0534d6a92b7f92468a3505b14ca42e7af","cross_cats_sorted":["physics.ins-det"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2011-08-19T17:33:03Z","title_canon_sha256":"2814262ce13086c20fc41e69e586187059510d3eb438c690206cfbc7e49afc83"},"schema_version":"1.0","source":{"id":"1108.4015","kind":"arxiv","version":3}},"canonical_sha256":"187d9564130ec9c0f348b29f9a2a59ecce11976179a3ebd06e12111f6bcd2823","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"187d9564130ec9c0f348b29f9a2a59ecce11976179a3ebd06e12111f6bcd2823","first_computed_at":"2026-05-18T02:00:50.366615Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:00:50.366615Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WsCT1A+cMGJc93vUn4AO97ng5nwXgTNtdTc92HcqOwyAbGeyoosH+bW3wFY/1bb6EzLTqDNvP5La36MrCr8nBw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:00:50.367239Z","signed_message":"canonical_sha256_bytes"},"source_id":"1108.4015","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:96c7e40b2b8a25140eb80b63109b0d14f6985c0d9b1f3ff4424fee29f7f2068c","sha256:416744da5c99a3ecdb3cb968b44356295e5a45b084e1a021f09b958761d83211"],"state_sha256":"f4780f21af40993b8f2b0700038fbbfab915fbc1eac7d03d13067c7191533ef3"}