{
  "abstract": "We have developed a compact fibre-coupled active beamstop for simultaneous interception and time-resolved monitoring of the direct X-ray beam in synchrotron diffraction experiments. The complete beamstop tip has a maximum transverse dimension of 1 mm and incorporates a 700 $μ$m-wide Ce:YAG scintillator. The scintillator converts the intercepted X-rays into visible light, which is transported through a multimode optical fibre to a silicon photodiode at the bottom of the blade that is connected to a dedicated fast amplifier electronics. Tests with a pulsed laser yielded a system decay time of 69.4 ns, consistent with reported luminescence decay times for Ce:YAG. Measurements at the P14.EH2 end station of PETRA III demonstrated the detection of individual bunch signals separated by 192 ns in the 40-bunch operating mode. The active beamstop also provided an in-situ timing signal for synchronising an experimental sequence with the approximately 190 $μ$s transmission window of a mechanical X-ray chopper. The device therefore combines a compact obstruction of the direct beam with fast monitoring of X-ray timing and flux during diffraction data acquisition.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.21618",
  "author_total": 3,
  "authors": [
    {
      "name": "Friedjof Tellkamp"
    },
    {
      "name": "David von Stetten"
    },
    {
      "name": "Martin Kollewe"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/36ne6tme5wbc1.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.21618",
  "fulltext_url": null,
  "id": "36ne6tme5wbc1",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.21618",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.acc-ph"
    ],
    [
      "arxiv",
      "physics.ins-det"
    ],
    [
      "openalex",
      "3108|Radiation Detection and Scintillator Technologies"
    ]
  ],
  "openalex": "W7213885641",
  "pdf_url": "https://arxiv.org/pdf/2609.21618",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/36ne6tme5wbc1.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:03Z",
      "native_id": "2609.21618",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.21618"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.acc-ph",
      "subfield": "applied-instrumentation"
    }
  ],
  "title": "A compact fibre-coupled active beamstop for fast time-resolved monitoring of synchrotron X-ray beams",
  "title_text": "A compact fibre-coupled active beamstop for fast time-resolved monitoring of synchrotron X-ray beams",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:03Z",
  "url": "https://research.draconitic.com/paper/36ne6tme5wbc1",
  "venue": "arXiv",
  "versions": []
}