{
  "annotation_id": "db4d88af-5e7d-441a-b20c-9a2bf12a5a06",
  "date_created": "2026-03-02T18:01:06.555000Z",
  "date_modified": "2026-03-02T18:01:06.555000Z",
  "file_hash": "4db3e31f5425514d5c2cd7d385c0a3606bc003740831175228faba017c0ab5c3",
  "private": false,
  "record": {
    "abstract": "The properties of the electron source define the ultimate limit of the beam\nquality in linear accelerators like Free Electron Lasers (FEL). The goal is to\ndevelop an electron gun delivering beam emittance lower than current state of\nthe art. Such a gun should reduce the cost and size of an X-ray Free Electron\nLaser (XFEL). In this paper we present two concepts of field emitter cathodes\nwhich could potentially produce low emittance beam. The first challenging\nparameter for such cathode is to emit peak current as high as 5 A. This is the\nminimum current requirement for the XFEL concept from Paul Scherrer Institut.1\nMaximum current of 0.12 A and 0.58 A have been reached respectively with field\nemitter arrays (FEA) and single needle cathodes. Laser assisted field emission\ngave encouraging results to reach even higher peak current and to pre-bunch the\nbeam.",
    "arxiv_id": "physics/0602009",
    "authors": [
      "R. Ganter",
      "R. J. Bakker",
      "R. Betemps",
      "M. Dehler",
      "T. Gerber",
      "J. Gobrecht",
      "C. Gough",
      "M. Johnson",
      "E. Kirk",
      "G. Knopp",
      "F. Le Pimpec",
      "K. Li",
      "M. Paraliev",
      "M. Pedrozzi",
      "L. Rivkin",
      "H. Sehr",
      "L. Schulz",
      "A. Wrulich"
    ],
    "categories": [
      "physics.acc-ph"
    ],
    "doi": "10.1116/1.2174025",
    "journal_ref": "J.Vac.Sci.Tech. B24 (2006) 974",
    "title": "Nanoseconds field emitted current pulses from ZrC needles and field   emitter arrays",
    "url": "https://arxiv.org/abs/physics/0602009"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b98729cf-f040-41db-93fc-d4b6556cf03b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}