{
  "abstract": "Bulk niobium has long been the material of choice for superconducting radio-frequency applications. An alternative approach is the superconductor-insulator-superconductor multilayer structure, which enables the use of brittle high-$T_c$ materials such as NbTiN. At present, SIS coatings are limited to flat samples, with the single-cell TESLA cavity representing a key milestone. Extending coating processes to non-flat geometries is expected to introduce macroscopic inhomogeneities in coating thickness. We model these variations using Gaussian random fields parametrized by a length scale, and generated by solving a stochastic partial differential equation. The resulting field is incorporated into the boundary condition of the cavity eigenvalue problem, from which quantities of interest -- such as resonant frequency and quality factor -- are computed. This procedure is repeated for eight length scales, with \\num{2048} samples per length scale, where the resulting quality factors are recorded. Our results show that the quality factors follow a normal distribution. The standard deviation increases with the length scale and can be statistically distinguished. In contrast, the mean values remain largely unchanged, with only a few significant differences. In extreme cases, depending on the length scale, the quality factor may differ from the uniform case by \\SIrange{2}{6}{\\percent}.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Phys. Rev. Accel. Beams 29, 103802 (2026)",
  "arxiv": "2605.05505",
  "author_total": 3,
  "authors": [
    {
      "name": "Aaron Gobeyn"
    },
    {
      "name": "Wolfgang Ackermann"
    },
    {
      "name": "Herbert De Gersem"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/facxctn5tpyf5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.05505",
  "fulltext_url": null,
  "id": "facxctn5tpyf5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.05505",
  "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"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2605.05505",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/facxctn5tpyf5.ris",
  "sources": [
    {
      "first_seen": "2026-11-10T06:21:23Z",
      "native_id": "2605.05505",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.05505"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.acc-ph",
      "subfield": "applied-instrumentation"
    }
  ],
  "title": "Numerical quality factor statistics for superconducting rf cavities with spatially inhomogeneous multilayer coatings modeled by Gaussian random fields",
  "title_text": "Numerical quality factor statistics for superconducting rf cavities with spatially inhomogeneous multilayer coatings modeled by Gaussian random fields",
  "type": "preprint",
  "updated_at": "2026-11-10T06:21:23Z",
  "url": "https://research.draconitic.com/paper/facxctn5tpyf5",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/hjqj-v5yc",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}