{
  "annotation_id": "1025ec50-51b5-48bc-9e9d-2d92a30ea6f8",
  "date_created": "2026-03-02T18:00:53.505000Z",
  "date_modified": "2026-03-02T18:00:53.505000Z",
  "file_hash": "8aade54fa46d88a5e30cfb0db23076b97f1c9ae6efd312cbd33ba502b72df50d",
  "private": false,
  "record": {
    "abstract": "In this work we study the ergodic magnetic limiters (EML) action on field\nlines from the point of view of a chaotic scattering process, considering the\nso-called exit basins, or sets of points in the chaotic region which originate\nfield lines hitting the wall in some specified region. We divide the tokamak\nwall into three areas of equal poloidal angular length, corresponding to\ndifferent exits for a chaotic field line. In order to obtain the exit basins we\nused a fine grid chosen inside a small rectangle which comprises a\nrepresentative part of the chaotic region near the wall. Thus, exit basins were\nobtained for a tokamak wall with reversed magnetic shear. The nontwist mapping\ndescribes the perturbed magnetic field lines with two twin chains of magnetic\nislands and chaotic field lines in their vicinity. For a perturbing resonant\nmagnetic field with a fixed helicity, the observed escape pattern changes with\nthe perturbation intensity.",
    "arxiv_id": "physics/0408082",
    "authors": [
      "Marisa Roberto",
      "Elton C. Da Silva",
      "Ibere L. Caldas",
      "Ricardo L. Viana"
    ],
    "categories": [
      "physics.plasm-ph"
    ],
    "title": "Escape patterns due to ergodic magnetic limiters in tokamaks with   reversed magnetic shear",
    "url": "https://arxiv.org/abs/physics/0408082"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "cae6eab0-ba28-4180-bf58-1952989dfb3d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}