{
  "annotation_id": "d27ef133-3baa-4278-b1ad-81293238c01c",
  "date_created": "2026-03-02T18:00:32.415000Z",
  "date_modified": "2026-03-02T18:00:32.415000Z",
  "file_hash": "807e7c39460fe0f3c0a27abcac8cd06fbf93fcc37066afaeee3221c5c50f07c2",
  "private": false,
  "record": {
    "abstract": "The design, construction and operation of a Compton back-scattering laser\npolarimeter at the HERA storage ring at DESY are described. The device measures\nthe longitudinal polarization of the electron beam between the spin rotators at\nthe HERMES experiment with a fractional systematic uncertainty of 1.6%. A\nmeasurement of the beam polarization to an absolute statistical precision of\n0.01 requires typically one minute when the device is operated in the\nmulti-photon mode. The polarimeter also measures the polarization of each\nindividual electron bunch to an absolute statistical precision of 0.06 in\napproximately five minutes. It was found that colliding and non-colliding\nbunches can have substantially different polarizations. This information is\nimportant to the collider experiments H1 and ZEUS for their future\nlongitudinally polarized electron program because those experiments use the\ncolliding bunches only.",
    "arxiv_id": "physics/0009047",
    "authors": [
      "M. Beckmann",
      "A. Borissov",
      "S. Brauksiepe",
      "F. Burkart",
      "H. Fischer",
      "J. Franz",
      "F. H. Heinsius",
      "K. Konigsmann",
      "W. Lorenzon",
      "F. M. Menden",
      "A. Most",
      "S. Rudnitsky",
      "C. Schill",
      "J. Seibert",
      "A. Simon"
    ],
    "categories": [
      "physics.ins-det",
      "hep-ex"
    ],
    "doi": "10.1016/S0168-9002(01)00901-9",
    "journal_ref": "Nucl.Instrum.Meth.A479:334-348,2002",
    "title": "The Longitudinal Polarimeter at HERA",
    "url": "https://arxiv.org/abs/physics/0009047"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "110a9e1c-90ee-4ec5-ba0f-27dbe37f4de3",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}