{
  "abstract": "A threshold Cherenkov counter based on ultraviolet-transmitting (UVT) acrylic has been developed for hadron identification in the S-2S spectrometer at J-PARC. Three 730 mm $\\times$ 100 mm $\\times$ 50 mm radiators were beam tested: polished UVT acrylic without WLS, UVT acrylic roughened on the four long surfaces without WLS, and polished UVT acrylic containing 10 ppm by mass bis-MSB as a wavelength shifter (WLS). The polished/WLS prototype gave the largest two-ended photoelectron yield among the tested configurations. At a 1-photoelectron software-SUM threshold, its measured detection efficiency remained above 99% throughout the scanned longitudinal range, with no significant degradation up to an average extracted-particle rate of approximately $2.5\\times10^{5}~{\\rm s^{-1}}$ during beam delivery. Beam observables constrained a Geant4 optical model with one common detector response scale and no PMT-specific response tuning. The model reproduces the observed response hierarchy and main longitudinal trends. In the central |y| < 200 mm region, simulated and measured MPV estimators for the calibration configurations typically agree within about 15%, while larger deviations occur toward the radiator ends, especially for rough/no-WLS. With the calibrated parameters fixed, the model was used to compare unmeasured detector configurations and quantify the momentum dependence of $K^{+}$/p discrimination. In the central, normal incidence geometry, a 90% $K^{+}$-survival working point is predicted to keep proton survival below 3% up to about 1.8 GeV/c. The measurements and constrained extrapolations support the polished UVT/WLS configuration for S-2S and quantify its expected particle-identification reach beyond the simple threshold regime.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.34712",
  "author_total": 29,
  "authors": [
    {
      "name": "Toshiyuki Gogami"
    },
    {
      "name": "Tomohiro Taniguchi"
    },
    {
      "name": "Daigo Watanabe"
    },
    {
      "name": "Jung Keun Ahn"
    },
    {
      "name": "Elena Botta"
    },
    {
      "name": "Kengo Ebata"
    },
    {
      "name": "Alessandro Feliciello"
    },
    {
      "name": "Hiroyuki Fujioka"
    },
    {
      "name": "Manami Fujita"
    },
    {
      "name": "Takeshi Harada"
    },
    {
      "name": "Shuhei Hayakawa"
    },
    {
      "name": "Yuning Hong"
    },
    {
      "name": "Yudai Ichikawa"
    },
    {
      "name": "Ryo Imamoto"
    },
    {
      "name": "Kei Ishido"
    },
    {
      "name": "Saya Iwai"
    },
    {
      "name": "Teppei Iwamoto"
    },
    {
      "name": "Koji Miwa"
    },
    {
      "name": "Tomofumi Nagae"
    },
    {
      "name": "Takuya Nanamura"
    },
    {
      "name": "Ruri Sasaki"
    },
    {
      "name": "Chesu Seong"
    },
    {
      "name": "Shun Shibata"
    },
    {
      "name": "Shuji Takahashi"
    },
    {
      "name": "Hirokazu Tamura"
    },
    {
      "name": "Kiyoshi Tanida"
    },
    {
      "name": "Kotaro Tsutsumi"
    },
    {
      "name": "Mifuyu Ukai"
    },
    {
      "name": "Takeshi Yamamoto"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2df3eckkhc9nj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.34712",
  "fulltext_url": null,
  "id": "2df3eckkhc9nj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.34712",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.ins-det"
    ],
    [
      "openalex",
      "3106|Particle Detector Development and Performance"
    ]
  ],
  "openalex": "W7223972879",
  "pdf_url": "https://arxiv.org/pdf/2610.34712",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-26",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2df3eckkhc9nj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2610.34712",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.34712"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.ins-det",
      "subfield": "applied-instrumentation"
    }
  ],
  "title": "Beam performance and data-constrained optical modeling of a UV-transmitting acrylic Cherenkov counter for hadron identification",
  "title_text": "Beam performance and data-constrained optical modeling of a UV-transmitting acrylic Cherenkov counter for hadron identification",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/2df3eckkhc9nj",
  "venue": "arXiv",
  "versions": []
}