{
  "abstract": "A very-high-frequency (VHF) electron gun operating at a resonant frequency of 216.667 MHz has been developed at Tsinghua University for the Shenzhen Superconducting Soft X-ray Free-Electron Laser ($\\rm S^3FEL$) facility. Building upon the SHINE gun design, the cavity profile was optimized to achieve a higher cathode electric-field gradient and a higher accelerating voltage at comparable input power. The revised cavity geometry also yields improved multipacting performance. In addition, thermal analysis was carried out to guide the water-cooling design, and enhanced cooling was implemented in the vicinity of the cathode. During high-power conditioning, 82 kW of continuous-wave radio-frequency power was successfully coupled into the gun, corresponding to a cathode gradient of 29.9 MV/m and an accelerating voltage of 856 kV. The gun voltage surpasses the previous world record for room-temperature VHF guns. The maximum dark current measured by the Faraday cup at the gun exit was only 6.8 nA.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.07604",
  "author_total": 14,
  "authors": [
    {
      "name": "Lianmin Zheng"
    },
    {
      "name": "Yitong Duan"
    },
    {
      "name": "Yuanyuan Qin"
    },
    {
      "name": "Baiting Song"
    },
    {
      "name": "Yang Yu"
    },
    {
      "name": "Zixuan Dong"
    },
    {
      "name": "Yijiang Zhu"
    },
    {
      "name": "Yanqing Jia"
    },
    {
      "name": "Jiaru Shi"
    },
    {
      "name": "Renkai Li"
    },
    {
      "name": "Wenhui Huang"
    },
    {
      "name": "Huaibi Chen"
    },
    {
      "name": "Chuanxiang Tang"
    },
    {
      "name": "Yingchao Du"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bh0emmmz85d0h.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.07604",
  "fulltext_url": null,
  "id": "bh0emmmz85d0h",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.07604",
  "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": "W7220983404",
  "pdf_url": "https://arxiv.org/pdf/2610.07604",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-06",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bh0emmmz85d0h.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:22Z",
      "native_id": "2610.07604",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.07604"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.acc-ph",
      "subfield": "applied-instrumentation"
    }
  ],
  "title": "Development of a continuous-wave photocathode very-high-frequency electron gun for $\\rm S^3FEL$",
  "title_text": "Development of a continuous-wave photocathode very-high-frequency electron gun for S^3FEL",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:22Z",
  "url": "https://research.draconitic.com/paper/bh0emmmz85d0h",
  "venue": "arXiv",
  "versions": []
}