{
  "abstract": "A quadrupole resonator (QPR) provides a sample-based platform for characterizing materials for superconducting radio-frequency (SRF) applications under controlled field, frequency, and temperature conditions. This paper presents the design optimization, commissioning, and validation of the Jefferson Lab QPR system, including a quantitative assessment of measurement uncertainty. The resonator geometry was re-optimized from the CERN version-II design to improve quadrupole-mode separation and enable four usable modes at 400, 806, 1221, and 1640 MHz. The measurement system combines self-excited-loop RF operation, cable-loss-corrected power calibration, decay-based external-Q calibration, and RF-DC thermal-substitution calorimetry to determine the peak surface magnetic field Bpk and sample surface resistance Rs. Commissioning measurements on bulk Nb and Nb3Sn-Ta-Cu samples validated the system response over a broad range of frequency, temperature, and RF field. The extracted superconducting energy-gap parameters are consistent with the reported values for Nb and Nb3Sn, as well as with those obtained from single-cell cavity measurements. The commissioned system operates from 1.8 K to near the superconducting transition temperature of the sample, with accessible Bpk values from approximately 5 mT to a sample- and temperature-dependent heater-power-budget limit; a maximum field of 60 mT was demonstrated for bulk Nb at 400 MHz and 4 K. The combined relative standard uncertainties are 8.3% for Bpk and below 18% for Rs when r = PDC2/PDC1 is less than 0.9. The worst-case Bpk resolution at the 95% confidence level is approximately 1.35 mT, while the Rs resolution is below 1 nOhm at 10 mT and 2 K. These results establish the JLab QPR as a calibrated, multi-frequency platform with quantified measurement uncertainty for SRF material characterization.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.04293",
  "author_total": 17,
  "authors": [
    {
      "name": "Mingqi Ge"
    },
    {
      "name": "Sarra Bira"
    },
    {
      "name": "Kristof Brunner"
    },
    {
      "name": "Natalie Gale"
    },
    {
      "name": "Marco Garlasche"
    },
    {
      "name": "Valentin Giglia"
    },
    {
      "name": "Oleksandr Hryhorenko"
    },
    {
      "name": "Justin Kent"
    },
    {
      "name": "Peter Owen"
    },
    {
      "name": "Uttar Pudasaini"
    },
    {
      "name": "Guillaume Rosaz"
    },
    {
      "name": "Karol Scibor"
    },
    {
      "name": "Pramita Tiwari"
    },
    {
      "name": "Anne-Marie Valente-Feliciano"
    },
    {
      "name": "Lorena Vega Cid"
    },
    {
      "name": "Walter Venturini"
    },
    {
      "name": "Haipeng Wang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/b06ygqwjckpk2.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.04293",
  "fulltext_url": null,
  "id": "b06ygqwjckpk2",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.04293",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.acc-ph"
    ],
    [
      "openalex",
      "2202|Particle accelerators and beam dynamics"
    ]
  ],
  "openalex": "W7211868152",
  "pdf_url": "https://arxiv.org/pdf/2609.04293",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/b06ygqwjckpk2.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:14Z",
      "native_id": "2609.04293",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.04293"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.acc-ph",
      "subfield": "applied-instrumentation"
    }
  ],
  "title": "Design optimization, commissioning, and uncertainty analysis of the quadrupole resonator system at Jefferson Lab for SRF material characterization",
  "title_text": "Design optimization, commissioning, and uncertainty analysis of the quadrupole resonator system at Jefferson Lab for SRF material characterization",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:14Z",
  "url": "https://research.draconitic.com/paper/b06ygqwjckpk2",
  "venue": "arXiv",
  "versions": []
}