{
  "abstract": "Microwave diagnostics are essential for plasma control and physics studies in magnetic confinement fusion, providing measurements of electron density, electron temperature, and energetic-particle behavior. However, diagnostic access in future burning-plasma reactors will be severely constrained by breeding blankets, neutron shielding, and compact reactor geometries, requiring reduced blanket opening areas while maintaining diagnostic capability. This work presents a compact waveguide diplexer for front-end integration of multiple microwave diagnostics. The proposed diplexer combines a waveguide T-junction with two iris-coupled sixth-order Chebyshev bandpass filters, enabling microwave reflectometry and electron cyclotron emission (ECE) diagnostics to share a common transmission line while operating in separate frequency bands. As an initial study, the diplexer is designed for the 65-70 GHz reflectometry and 85-90 GHz ECE systems on the J-TEXT tokamak. Full-wave electromagnetic simulations demonstrate insertion losses below 1 dB and channel isolation exceeding 40 dB across both operating bands. The proposed methodology provides a compact and scalable approach to microwave diagnostic integration and establishes a practical basis for multi-diagnostic front-end systems in future fusion devices.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.34881",
  "author_total": 9,
  "authors": [
    {
      "name": "Xiaoliang Li"
    },
    {
      "name": "Valerian Hall-Chen"
    },
    {
      "name": "Umesh Kumar"
    },
    {
      "name": "Eddie Chua"
    },
    {
      "name": "Tengfei Tang"
    },
    {
      "name": "Andy Yeoh"
    },
    {
      "name": "Khadija Rahman"
    },
    {
      "name": "Xinhang Xu"
    },
    {
      "name": "Yilun Zhu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/38215b438c4ke.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.34881",
  "fulltext_url": null,
  "id": "38215b438c4ke",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.34881",
  "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.plasm-ph"
    ],
    [
      "openalex",
      "3106|Magnetic confinement fusion research"
    ]
  ],
  "openalex": "W7223922676",
  "pdf_url": "https://arxiv.org/pdf/2610.34881",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-26",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/38215b438c4ke.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2610.34881",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.34881"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.plasm-ph",
      "subfield": "plasma"
    }
  ],
  "title": "Toward Integrated Microwave Diagnostics for Future Fusion Devices: Design of a Compact Waveguide Diplexer",
  "title_text": "Toward Integrated Microwave Diagnostics for Future Fusion Devices: Design of a Compact Waveguide Diplexer",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/38215b438c4ke",
  "venue": "arXiv",
  "versions": []
}