{
  "annotation_id": "675f4a72-fb9f-4bf1-b12f-b8744f52bd37",
  "date_created": "2026-03-02T18:00:39.610000Z",
  "date_modified": "2026-03-02T18:00:39.610000Z",
  "file_hash": "527724c29880c87c7331e6a535b94f2bf117f2dd7f84833a97b5c6058f7073cb",
  "private": false,
  "record": {
    "abstract": "We report the experimental observation of the alpha-effect. It consists in\nthe generation of a current parallel to a magnetic field B0 applied to a\nturbulent swirling flow of liquid sodium. At low magnetic Reynolds number, Rm,\nwe show that the magnitude of the alpha-effect increases like Rm2 and that its\nsign is determined by the flow helicity. It saturates and then decreases at\nlarge Rm, primarily because of the expulsion of the applied field B0 from the\nbulk of the flow. We show how this expulsion is affected by the flow geometry\nby varying the relative amplitudes of the azimuthal and axial flows.",
    "arxiv_id": "physics/0205019",
    "authors": [
      "F. Petrelis",
      "M. Bourgoin",
      "L. Marie",
      "J. Burguete",
      "A. Chiffaudel",
      "F. Daviaud",
      "S. Fauve",
      "P. Odier",
      "J. F. Pinton"
    ],
    "categories": [
      "physics.flu-dyn"
    ],
    "title": "The alpha effect and its saturation in a turbulent swirling flow   generated in the VKS experiment",
    "url": "https://arxiv.org/abs/physics/0205019"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "88700312-4f66-4068-83f5-5dbb5ed0ebab",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}