{
  "abstract": "FINESSE (A Versatile Beamline for \\textbf{F}undamental \\textbf{I}nteractions with \\textbf{N}eutrons at the \\textbf{E}uropean \\textbf{S}pallation \\textbf{S}ourc\\textbf{E}) is a proposed versatile beamline for fundamental interactions with neutrons at the European Spallation Source. Building on the HIBEAM design studies, FINESSE extends the original concept into a dual-guide beamline capable of operating either in a high-flux configuration or in a low-background configuration within a single ESS beam port. The high-flux branch is optimized for rare-process searches, including neutron--antineutron oscillations, neutron--sterile-neutron transitions, axion-like-particle searches, neutron charge measurements, and rare neutron decays. The low-background branch is designed for precision measurements requiring strong suppression of prompt and line-of-sight backgrounds, with a cryogenic neutron electric-dipole-moment experiment used as a benchmark case. A baseline exchangeable-guide concept has been developed in which only short guide sections inside the ESS bunker are exchanged, while the upstream extraction system and chopper positions remain fixed. A staged implementation, Short FINESSE, would use the upstream section of the high-flux beamline together with a compact magnetically controlled experimental region, enabling an early physics and R\\&D programme before completion of the full facility. This paper summarizes the scientific case, beamline concept, guide simulations, chopper and timing system, magnetic-field control, detector developments, and staged implementation strategy. FINESSE would establish a long-term particle-physics infrastructure at ESS, providing a beamline for both discovery-driven searches and precision neutron measurements throughout the lifetime of the facility.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.17373",
  "author_total": 74,
  "authors": [
    {
      "name": "J. Amaral"
    },
    {
      "name": "J. Barrow"
    },
    {
      "name": "M. Bartis"
    },
    {
      "name": "D. H. Beck"
    },
    {
      "name": "P. M. Bentley"
    },
    {
      "name": "J. Bijnens"
    },
    {
      "name": "G. Brooijmans"
    },
    {
      "name": "L. J. Broussard"
    },
    {
      "name": "A. Burgman"
    },
    {
      "name": "G. Cibinetto"
    },
    {
      "name": "G. Croci"
    },
    {
      "name": "D. D. Di Julio"
    },
    {
      "name": "P. Fierlinger"
    },
    {
      "name": "B. W. Filippone"
    },
    {
      "name": "C. Gatto"
    },
    {
      "name": "H. Gisbert"
    },
    {
      "name": "H. Gogoi"
    },
    {
      "name": "G. Gorini"
    },
    {
      "name": "A. Gutierrez-Rodriguez"
    },
    {
      "name": "A. Koberinski"
    },
    {
      "name": "M. Kaczmarek"
    },
    {
      "name": "M. Silarski"
    },
    {
      "name": "M. O'Riordan"
    },
    {
      "name": "A. Heinz"
    },
    {
      "name": "J. Henderson"
    },
    {
      "name": "M. Holl"
    },
    {
      "name": "H. T. Johansson"
    },
    {
      "name": "B. Jonsson"
    },
    {
      "name": "H. Henriksson"
    },
    {
      "name": "L. Jonsson"
    },
    {
      "name": "Y. Kamyshkov"
    },
    {
      "name": "M. P. Kuhl"
    },
    {
      "name": "P. Kinhult"
    },
    {
      "name": "R. Kolevatov"
    },
    {
      "name": "A. Kozela"
    },
    {
      "name": "W. T. Lee"
    },
    {
      "name": "K. K. H. Leung"
    },
    {
      "name": "T. -J. Liang"
    },
    {
      "name": "G. Luzin"
    },
    {
      "name": "B. Meirose"
    },
    {
      "name": "D. Milstead"
    },
    {
      "name": "R. Mohapatra"
    },
    {
      "name": "G. Muhrer"
    },
    {
      "name": "A. Muraro"
    },
    {
      "name": "A. Nepomuceno"
    },
    {
      "name": "N. Okada"
    },
    {
      "name": "A. Oskarsson"
    },
    {
      "name": "T. Palasz"
    },
    {
      "name": "R. Pasechnik"
    },
    {
      "name": "V. Larsson"
    },
    {
      "name": "L. B. Persson"
    },
    {
      "name": "O. Putignano"
    },
    {
      "name": "J. Ramsey"
    },
    {
      "name": "C. Snow"
    },
    {
      "name": "L. Werselius"
    },
    {
      "name": "B. Rataj"
    },
    {
      "name": "A. Rodriguez-Sanchez"
    },
    {
      "name": "A. Saunders"
    },
    {
      "name": "V. Santoro"
    },
    {
      "name": "F. Scioscioli"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9f4qbxxfqt5se.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.17373",
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    [
      "arxiv",
      "hep-ex"
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      "arxiv",
      "nucl-ex"
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      "arxiv",
      "physics.ins-det"
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      "openalex",
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  "pdf_url": "https://arxiv.org/pdf/2610.17373",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-12",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9f4qbxxfqt5se.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:06Z",
      "native_id": "2610.17373",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.17373"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.ins-det",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:nucl-ex",
      "subfield": "nuclear"
    }
  ],
  "title": "FINESSE: A Versatile Beamline for Fundamental Interactions with Neutrons at the European Spallation SourcE",
  "title_text": "FINESSE: A Versatile Beamline for Fundamental Interactions with Neutrons at the European Spallation SourcE",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:06Z",
  "url": "https://research.draconitic.com/paper/9f4qbxxfqt5se",
  "venue": "arXiv",
  "versions": []
}