{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:QCEZTNUVPKYC6DWESMQBGV7F6B","short_pith_number":"pith:QCEZTNUV","canonical_record":{"source":{"id":"1503.08061","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2015-03-27T13:15:52Z","cross_cats_sorted":[],"title_canon_sha256":"5f3c666145f5026c385d88598812ff9dede1c6c9bd309174ffc1271f2e26ad28","abstract_canon_sha256":"a48e5ca2453a47124bc00314924c8fcf7adea8a802941e145433225756ef5511"},"schema_version":"1.0"},"canonical_sha256":"808999b6957ab02f0ec493201357e5f060c7b502bac79b1573cc0b14e821d489","source":{"kind":"arxiv","id":"1503.08061","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1503.08061","created_at":"2026-05-18T02:18:51Z"},{"alias_kind":"arxiv_version","alias_value":"1503.08061v1","created_at":"2026-05-18T02:18:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.08061","created_at":"2026-05-18T02:18:51Z"},{"alias_kind":"pith_short_12","alias_value":"QCEZTNUVPKYC","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"QCEZTNUVPKYC6DWE","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"QCEZTNUV","created_at":"2026-05-18T12:29:37Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:QCEZTNUVPKYC6DWESMQBGV7F6B","target":"record","payload":{"canonical_record":{"source":{"id":"1503.08061","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2015-03-27T13:15:52Z","cross_cats_sorted":[],"title_canon_sha256":"5f3c666145f5026c385d88598812ff9dede1c6c9bd309174ffc1271f2e26ad28","abstract_canon_sha256":"a48e5ca2453a47124bc00314924c8fcf7adea8a802941e145433225756ef5511"},"schema_version":"1.0"},"canonical_sha256":"808999b6957ab02f0ec493201357e5f060c7b502bac79b1573cc0b14e821d489","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:18:51.054830Z","signature_b64":"nkm4Cf/uiYBbNCVkOz/RffHmQ9CcohcvlFkbmz634n9x0GaANeBpXVnhTHkrw9cGCyVDSC7iukhzZ3d01UpEDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"808999b6957ab02f0ec493201357e5f060c7b502bac79b1573cc0b14e821d489","last_reissued_at":"2026-05-18T02:18:51.054353Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:18:51.054353Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1503.08061","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":"2026-05-18T02:18:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IqZPTY4n7e0WGJv8pMVYQskY1fN5tJsFt5si5QXLeCqpnJ/DAn9Gr3/liIIAMx7zf8NDJTnGkQi8L6Gv6b6xBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T22:25:38.786066Z"},"content_sha256":"2e0a3dbb58df30e59e0ee1fbcba3b1c98899bade4d98e73c3c15effbf591420e","schema_version":"1.0","event_id":"sha256:2e0a3dbb58df30e59e0ee1fbcba3b1c98899bade4d98e73c3c15effbf591420e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:QCEZTNUVPKYC6DWESMQBGV7F6B","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Experimental Study of Waveguide Coupled Microwave Heating with Conventional Multicusp Negative Ion Source","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.plasm-ph","authors_text":"H. Koivisto, J. Komppula, J. Laulainen, O. Tarvainen, T. Kalvas","submitted_at":"2015-03-27T13:15:52Z","abstract_excerpt":"Negative ion production with conventional multicusp plasma chambers utilizing 2.45 GHz microwave heating is demonstrated. The experimental results were obtained with the multicusp plasma chambers and extraction systems of the RFdriven RADIS ion source and the filament driven arc discharge ion source LIISA. A waveguide microwave coupling system, which is almost similar to the one used with the SILHI ion source, was used. The results demonstrate that at least one third of negative ion beam obtained with inductive RF-coupling (RADIS) or arc discharge (LIISA) can be achieved with 1 kW of 2.45 GHz "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.08061","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":""},"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":"2026-05-18T02:18:51Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EiZrueo2Ku7C0VYni9JDMHazOq3Ta8iCMjvWoh7nR5y8kWkPMrJaoH89zQwiLIc2UsEtAo1LEslWFIvtndKnAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T22:25:38.786438Z"},"content_sha256":"1f7505d39455a05532fe0af4a8d7245b48fd01918f2905f505fec632742b1398","schema_version":"1.0","event_id":"sha256:1f7505d39455a05532fe0af4a8d7245b48fd01918f2905f505fec632742b1398"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QCEZTNUVPKYC6DWESMQBGV7F6B/bundle.json","state_url":"https://pith.science/pith/QCEZTNUVPKYC6DWESMQBGV7F6B/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QCEZTNUVPKYC6DWESMQBGV7F6B/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":"2026-06-24T22:25:38Z","links":{"resolver":"https://pith.science/pith/QCEZTNUVPKYC6DWESMQBGV7F6B","bundle":"https://pith.science/pith/QCEZTNUVPKYC6DWESMQBGV7F6B/bundle.json","state":"https://pith.science/pith/QCEZTNUVPKYC6DWESMQBGV7F6B/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QCEZTNUVPKYC6DWESMQBGV7F6B/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:QCEZTNUVPKYC6DWESMQBGV7F6B","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":"a48e5ca2453a47124bc00314924c8fcf7adea8a802941e145433225756ef5511","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2015-03-27T13:15:52Z","title_canon_sha256":"5f3c666145f5026c385d88598812ff9dede1c6c9bd309174ffc1271f2e26ad28"},"schema_version":"1.0","source":{"id":"1503.08061","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1503.08061","created_at":"2026-05-18T02:18:51Z"},{"alias_kind":"arxiv_version","alias_value":"1503.08061v1","created_at":"2026-05-18T02:18:51Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1503.08061","created_at":"2026-05-18T02:18:51Z"},{"alias_kind":"pith_short_12","alias_value":"QCEZTNUVPKYC","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_16","alias_value":"QCEZTNUVPKYC6DWE","created_at":"2026-05-18T12:29:37Z"},{"alias_kind":"pith_short_8","alias_value":"QCEZTNUV","created_at":"2026-05-18T12:29:37Z"}],"graph_snapshots":[{"event_id":"sha256:1f7505d39455a05532fe0af4a8d7245b48fd01918f2905f505fec632742b1398","target":"graph","created_at":"2026-05-18T02:18:51Z","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":"Negative ion production with conventional multicusp plasma chambers utilizing 2.45 GHz microwave heating is demonstrated. The experimental results were obtained with the multicusp plasma chambers and extraction systems of the RFdriven RADIS ion source and the filament driven arc discharge ion source LIISA. A waveguide microwave coupling system, which is almost similar to the one used with the SILHI ion source, was used. The results demonstrate that at least one third of negative ion beam obtained with inductive RF-coupling (RADIS) or arc discharge (LIISA) can be achieved with 1 kW of 2.45 GHz ","authors_text":"H. Koivisto, J. Komppula, J. Laulainen, O. Tarvainen, T. Kalvas","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2015-03-27T13:15:52Z","title":"An Experimental Study of Waveguide Coupled Microwave Heating with Conventional Multicusp Negative Ion Source"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.08061","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":"sha256:2e0a3dbb58df30e59e0ee1fbcba3b1c98899bade4d98e73c3c15effbf591420e","target":"record","created_at":"2026-05-18T02:18:51Z","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":"a48e5ca2453a47124bc00314924c8fcf7adea8a802941e145433225756ef5511","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.plasm-ph","submitted_at":"2015-03-27T13:15:52Z","title_canon_sha256":"5f3c666145f5026c385d88598812ff9dede1c6c9bd309174ffc1271f2e26ad28"},"schema_version":"1.0","source":{"id":"1503.08061","kind":"arxiv","version":1}},"canonical_sha256":"808999b6957ab02f0ec493201357e5f060c7b502bac79b1573cc0b14e821d489","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"808999b6957ab02f0ec493201357e5f060c7b502bac79b1573cc0b14e821d489","first_computed_at":"2026-05-18T02:18:51.054353Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:18:51.054353Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nkm4Cf/uiYBbNCVkOz/RffHmQ9CcohcvlFkbmz634n9x0GaANeBpXVnhTHkrw9cGCyVDSC7iukhzZ3d01UpEDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:18:51.054830Z","signed_message":"canonical_sha256_bytes"},"source_id":"1503.08061","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2e0a3dbb58df30e59e0ee1fbcba3b1c98899bade4d98e73c3c15effbf591420e","sha256:1f7505d39455a05532fe0af4a8d7245b48fd01918f2905f505fec632742b1398"],"state_sha256":"b984536c2c49857b0d7c80a593ddb89441cc79b4761cebe732be98fbfcaeaa7e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+/xBa2VYvbyg8jnhAWl8n4FVqFrnZURgMy1sk028IkZk+3M+g0jy0OGZpfb1d270nOm9SBC8fT+WuHNLdeZ8Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-24T22:25:38.788504Z","bundle_sha256":"c4e2707db880a8a3a5adb304d7b67157af5bd71ed1a80f2d06cff1e848219078"}}