{
  "annotation_id": "4df81647-03c6-417c-9c56-dd4e3f9f8eee",
  "date_created": "2026-03-02T18:01:24.961000Z",
  "date_modified": "2026-03-02T18:01:24.961000Z",
  "file_hash": "9094d141dc898cb1a6bd4eb2543a3fd29c6dc896eee342adaf075a5155c21092",
  "private": false,
  "record": {
    "abstract": "The emission optics of a Steigerwald type electron gun is re-examined. The\nvirtual and real points of divergence, divergence angles and beam-widths of the\nelectron beams at different telefocusing strength are measured in detail for\nfirst time . Two different Wehnelt cylinders are used to establish a\ncontrasting viewpoint. The original `focusing\u0027 curves measured by Braucks are\nreconstructed and will be explained only through a `new\u0027 interpretation which\nis different from the conventional views. While the image of the emitting\nsurface in front of the filament is indeed telefocused beyond the anode, the\nenvelope of the beam does not `focus\u0027 as expected. A new model for the emission\nmechanism is established based on our results.",
    "arxiv_id": "physics/9905031",
    "authors": [
      "Chong-Yu Ruan",
      "Manfred Fink"
    ],
    "categories": [
      "physics.optics",
      "physics.ins-det"
    ],
    "doi": "10.1063/1.1150053",
    "title": "Emission Optics of the Steigerwald Type Electron Gun",
    "url": "https://arxiv.org/abs/physics/9905031"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2acfd300-1c37-4c8f-8268-d8135c55b5ed",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}