{
  "annotation_id": "ec101b5c-2460-4638-ac3d-5a332ba51890",
  "date_created": "2026-03-02T18:00:53.243000Z",
  "date_modified": "2026-03-02T18:00:53.243000Z",
  "file_hash": "f36dc2d9da131c8ecb5a62db50f67ef7e4c9e6584685f52144b02d3a14dcf306",
  "private": false,
  "record": {
    "abstract": "The force on a microparticle in a complex plasma by streaming ions, the\nso-called ion drag force, is not well known. However, it is important for the\nunderstanding of interesting phenomena in complex plasmas such as the void\nformation under microgravity conditions. The PK-4 experiment, which is\ndeveloped for a later use on board of the International Space Station, is\nideally suited for investigating this problem. In this experiment a complex\nDC-plasma is created in a glass tube in which the microparticles flow from the\ncathode to the anode. Measuring the microparticle velocities, the forces on the\nparticles for different particle sizes, pressures, and DC-currents can be\nextracted by assuming force balance. Experiments have been performed in the\nlaboratory as well as under microgravity using parabolic flights. The results\nof these experiments will be presented and compared to theoretical predictions.",
    "arxiv_id": "physics/0411021",
    "authors": [
      "M. H. Thoma",
      "H. Hoefner",
      "S. A. Khrapak",
      "M. Kretschmer",
      "R. A. Quinn",
      "S. Ratynskaia",
      "G. E. Morfill",
      "A. Usachev",
      "A. Zobnin",
      "O. Petrov",
      "V. Fortov"
    ],
    "categories": [
      "physics.plasm-ph"
    ],
    "title": "Measurement of the Ion Drag Force in a Complex DC-Plasma Using the PK-4   Experiment",
    "url": "https://arxiv.org/abs/physics/0411021"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f07ff31a-0376-4df3-a71a-2297b03eef89",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}