{
  "annotation_id": "62d93ea5-d8ea-4e00-a04f-bdf70e2bd753",
  "date_created": "2026-03-02T18:01:11.453000Z",
  "date_modified": "2026-03-02T18:01:11.453000Z",
  "file_hash": "11879d25ec48cf19a5642eca76dc98045ab5134b2bbc5c2474d668b82efa22a1",
  "private": false,
  "record": {
    "abstract": "We describe the setup to create a large Bose-Einstein condensate containing\nmore than 120x10^6 atoms. In the experiment a thermal beam is slowed by a\nZeeman slower and captured in a dark-spot magneto-optical trap (MOT). A typical\ndark-spot MOT in our experiments contains 2.0x10^10 atoms with a temperature of\n320 microK and a density of about 1.0x10^11 atoms/cm^3. The sample is spin\npolarized in a high magnetic field, before the atoms are loaded in the magnetic\ntrap. Spin polarizing in a high magnetic field results in an increase in the\ntransfer efficiency by a factor of 2 compared to experiments without spin\npolarizing. In the magnetic trap the cloud is cooled to degeneracy in 50 s by\nevaporative cooling. To suppress the 3-body losses at the end of the\nevaporation the magnetic trap is decompressed in the axial direction.",
    "arxiv_id": "physics/0609028",
    "authors": [
      "K. M. R. van der Stam",
      "E. D. van Ooijen",
      "R. Meppelink",
      "J. M. Vogels",
      "P. van der Straten"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "doi": "10.1063/1.2424439",
    "title": "Large atom number Bose-Einstein condensate of sodium",
    "url": "https://arxiv.org/abs/physics/0609028"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ea2f2eea-11b9-45f9-96ef-6bc87137b1f5",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}