{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:DB6ZKZATB3E4B42IWKPZUKSZ5T","short_pith_number":"pith:DB6ZKZAT","canonical_record":{"source":{"id":"1108.4015","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2011-08-19T17:33:03Z","cross_cats_sorted":["physics.ins-det"],"title_canon_sha256":"2814262ce13086c20fc41e69e586187059510d3eb438c690206cfbc7e49afc83","abstract_canon_sha256":"34d7944aef735a79605571eb91d8faa0534d6a92b7f92468a3505b14ca42e7af"},"schema_version":"1.0"},"canonical_sha256":"187d9564130ec9c0f348b29f9a2a59ecce11976179a3ebd06e12111f6bcd2823","source":{"kind":"arxiv","id":"1108.4015","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"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:DB6ZKZATB3E4B42IWKPZUKSZ5T","target":"record","payload":{"canonical_record":{"source":{"id":"1108.4015","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.space-ph","submitted_at":"2011-08-19T17:33:03Z","cross_cats_sorted":["physics.ins-det"],"title_canon_sha256":"2814262ce13086c20fc41e69e586187059510d3eb438c690206cfbc7e49afc83","abstract_canon_sha256":"34d7944aef735a79605571eb91d8faa0534d6a92b7f92468a3505b14ca42e7af"},"schema_version":"1.0"},"canonical_sha256":"187d9564130ec9c0f348b29f9a2a59ecce11976179a3ebd06e12111f6bcd2823","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:00:50.367239Z","signature_b64":"WsCT1A+cMGJc93vUn4AO97ng5nwXgTNtdTc92HcqOwyAbGeyoosH+bW3wFY/1bb6EzLTqDNvP5La36MrCr8nBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"187d9564130ec9c0f348b29f9a2a59ecce11976179a3ebd06e12111f6bcd2823","last_reissued_at":"2026-05-18T02:00:50.366615Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:00:50.366615Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1108.4015","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:00:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TzKX90cw2DBXyunieYSsRK7B2N8lKbg/RqF9bQCn4kbAQ/PwpX3JKkM65JLC5b9MBnXpBB6SBwEd7Oa6rrkvDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T17:31:36.605607Z"},"content_sha256":"96c7e40b2b8a25140eb80b63109b0d14f6985c0d9b1f3ff4424fee29f7f2068c","schema_version":"1.0","event_id":"sha256:96c7e40b2b8a25140eb80b63109b0d14f6985c0d9b1f3ff4424fee29f7f2068c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:DB6ZKZATB3E4B42IWKPZUKSZ5T","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultraviolet stimulated electron source for use with low energy plasma instrument calibration","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.ins-det"],"primary_cat":"physics.space-ph","authors_text":"Elizabeth MacDonald, Herb Funsten, Kevin Henderson, Ron Harper","submitted_at":"2011-08-19T17:33:03Z","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."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.4015","kind":"arxiv","version":3},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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":"2026-05-18T02:00:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PmIsbQqDq2mWm2gZ8IlTHGypyQ6I6LrcuzwT8pMoJFLVZq0OEMC//M7Zps620hE4bPbYE3BENek9EzcosNqJAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T17:31:36.606016Z"},"content_sha256":"416744da5c99a3ecdb3cb968b44356295e5a45b084e1a021f09b958761d83211","schema_version":"1.0","event_id":"sha256:416744da5c99a3ecdb3cb968b44356295e5a45b084e1a021f09b958761d83211"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DB6ZKZATB3E4B42IWKPZUKSZ5T/bundle.json","state_url":"https://pith.science/pith/DB6ZKZATB3E4B42IWKPZUKSZ5T/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DB6ZKZATB3E4B42IWKPZUKSZ5T/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":"2026-06-04T17:31:36Z","links":{"resolver":"https://pith.science/pith/DB6ZKZATB3E4B42IWKPZUKSZ5T","bundle":"https://pith.science/pith/DB6ZKZATB3E4B42IWKPZUKSZ5T/bundle.json","state":"https://pith.science/pith/DB6ZKZATB3E4B42IWKPZUKSZ5T/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DB6ZKZATB3E4B42IWKPZUKSZ5T/bundle.json"},"state":{"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"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4qLA6foRMSPSXIyER7vXu0ElbRBapHWIB/fNRKTjeum+SsyQBHvUNa6NiuayF5y4Md8THHR6OmEL6P1IWsgqDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T17:31:36.608395Z","bundle_sha256":"90b2bc889c3bc63828f33f31c080220789bfc8e3cee1e50fe580a37712d42bb9"}}