{
  "annotation_id": "e0d87509-b79f-4243-99ea-035f9b202fcd",
  "date_created": "2026-03-02T18:01:11.453000Z",
  "date_modified": "2026-03-02T18:01:11.453000Z",
  "file_hash": "e4f35ad36e24da7e2cad2ecacc0cf3e02c3bd64d5d92ec932a1b23b7e823d68b",
  "private": false,
  "record": {
    "abstract": "We present a comprehensive analysis of coherence properties of the radiation\nfrom X-ray free electron laser (XFEL). We consider practically important case\nwhen XFEL is optimized for maximum gain. Such an optimization allows to reduce\nsignificantly parameter space. Application of similarity techniques to the\nresults of numerical simulations allows to present all output characteristics\nof the optimized XFEL as functions of the only parameter, ratio of the\nemittance to the radiation wavelength, $ \\hat{\\epsilon} = 2\\pi \\epsilon/\\lambda\n$. Our studies show that optimum performance of the XFEL in terms of transverse\ncoherence is achieved at the value of the parameter $\\hat{\\epsilon}$ of about\nunity. At smaller values of $\\hat{\\epsilon}$ the degree of transverse coherence\nis reduced due to strong influence of poor longitudinal coherence on a\ntransverse one. At large values of the emittance the degree of transverse\ncoherence degrades due to poor mode selection. Comparative analysis of existing\nXFEL projects, European XFEL, LCLS, and SCSS is presented as well.",
    "arxiv_id": "physics/0609057",
    "authors": [
      "E. L. Saldin",
      "E. A. Schneidmiller",
      "M. V. Yurkov"
    ],
    "categories": [
      "physics.acc-ph",
      "physics.optics"
    ],
    "title": "Coherence properties of the radiation from X-ray free electron laser",
    "url": "https://arxiv.org/abs/physics/0609057"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "c534132a-b67f-4926-b2c7-223b7af17195",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}