{
  "annotation_id": "02290b41-7f2c-4627-be38-af145971249b",
  "date_created": "2026-03-02T18:00:32.533000Z",
  "date_modified": "2026-03-02T18:00:32.533000Z",
  "file_hash": "b5bb80e677d4c075a8c1122d694543f46c64189f2536b210f14e35cb0c150b8b",
  "private": false,
  "record": {
    "abstract": "We report the results of observations of H- beam instabilities at the\nFermilab Linac. By intentionally creating \"high\" background pressure with\ndifferent gases in the 750 keV transport line we observed coherent transverse\nbeam oscillations. The minimal pulse length required to observe oscillations\nand the frequency of oscillations are functions of pressure and mass of the\nbackground gas. The oscillations are present in both transverse planes and very\nquickly reach saturation in amplitude growth. The observed characteristics of\nbeam oscillations are in quantitative agreement with \"fast beam-ion\ninstability\" described by Raubenheimer and Zimmermann. Effects described here\nare occur far from the normal operating range of the Fermilab Linac but may be\nimportant for many future high intensity accelerators.",
    "arxiv_id": "physics/0008173",
    "authors": [
      "Milorad Popovic",
      "Todd Sullivan"
    ],
    "categories": [
      "physics.acc-ph"
    ],
    "journal_ref": "eConf C000821:THB22,2000",
    "title": "Observation of a H- Beam Ion Instability",
    "url": "https://arxiv.org/abs/physics/0008173"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f6911ccc-6f43-4456-94db-f44d73862f77",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}