{
  "annotation_id": "da9dde05-f918-4a19-9472-fe746a52feda",
  "date_created": "2026-03-02T18:00:39.658000Z",
  "date_modified": "2026-03-02T18:00:39.658000Z",
  "file_hash": "e1867ac7b0c193c0e9e5d7f80c80f8d1ccb8e1543161fd413dcecb8422dd0819",
  "private": false,
  "record": {
    "abstract": "We study the feedback of positive ions in triple and quadruple Gas Electron\nMultiplier (GEM) detectors. The effects of GEM hole diameter, detector gain,\napplied voltages, number of GEMs and other parameters on ion feedback are\ninvestigated in detail. In particular, it was found that the ion feedback is\nindependent of the gas mixture and the pressure. In the optimized multi-GEM\nstructure, the ion feedback current can be suppressed down to 0.5% of the anode\ncurrent, at a drift field of 0.1 kV/cm and gain of 10^4. A simple model of ion\nfeedback in multi-GEM structures is suggested. The results obtained are\nrelevant to the performance of time projection chambers and gas\nphotomultipliers.",
    "arxiv_id": "physics/0208017",
    "authors": [
      "A. Bondar",
      "A. Buzulutskov",
      "L. Shekhtman",
      "A. Vasiljev"
    ],
    "categories": [
      "physics.ins-det"
    ],
    "doi": "10.1016/S0168-9002(02)01763-1",
    "journal_ref": "Nucl.Instrum.Meth. A496 (2003) 325-332",
    "title": "Study of ion feedback in multi-GEM structures",
    "url": "https://arxiv.org/abs/physics/0208017"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "93efbea6-5ee8-478a-bec2-ab7ee6c99a7f",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}