{
  "annotation_id": "a79a292e-cee9-4bef-ad69-d005f6797456",
  "date_created": "2026-03-02T18:01:55.731000Z",
  "date_modified": "2026-03-02T18:01:55.731000Z",
  "file_hash": "f9e6123ae902d4ba909a38c2d7ada9ad9510fef9617ef36a4e6b30e1c191b8a5",
  "private": false,
  "record": {
    "abstract": "We report a study of the axialisation and laser cooling of single ions and\nsmall clouds of ions in a Penning trap. A weak radiofrequency signal applied to\na segmented ring electrode couples the magnetron motion to the cyclotron\nmotion, which results in improved laser cooling of the magnetron motion. This\nallows us to approach the trapping conditions of a Paul trap, but without any\nmicromotion. Using an ICCD camera we show that the motion of a single ion can\nbe confined to dimensions of the order of 10 $\\mu$m. We have measured increased\nmagnetron cooling rates using an rf-photon correlation technique. For certain\nlaser cooling conditions, the magnetron motion of the centre of mass of the\ncloud grows and stabilises at a large value. This results in the ions orbiting\nthe centre of the trap together in a small cloud, as confirmed by photon-photon\ncorrelation measurements.",
    "arxiv_id": "quant-ph/0211016",
    "authors": [
      "H. F. Powell",
      "S. R. de Echaniz",
      "E. S. Phillips",
      "D. M. Segal",
      "R. C. Thompson"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Improvement of Laser Cooling of Ions in a Penning Trap by use of the   Axialisation Technique",
    "url": "https://arxiv.org/abs/quant-ph/0211016"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b656f646-445b-47be-a440-106d05899dc9",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}