{
  "abstract": "Quantum efficiency (QE) is a key property of photocathodes, and its uniformity is essential for producing high-brightness electron beams. Cathode imaging provides an \\textit{in-situ} and real-time approach for QE mapping, but in RF guns, a high charge per bunch is often needed to obtain a sufficient signal-to-noise ratio. Under such conditions, space charge effects can significantly degrade the imaging resolution and may even make point-to-point cathode imaging ineffective. In this paper, we propose a novel cathode imaging method based on a magnetized electron beam. Its feasibility is examined through theoretical analysis and beam dynamics simulations. The results show that the proposed method enables point-to-point cathode imaging in the ten picocoulomb charge regime. For a 10 pC, 3ps beam with a cathode magnetic field of 1200 Gauss, simulations indicate an imaging resolution of 11 um, representing nearly an order-of-magnitude improvement over the non-magnetized beam method.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.02070",
  "author_total": 3,
  "authors": [
    {
      "name": "Yihan Liu"
    },
    {
      "name": "Lianmin Zheng"
    },
    {
      "name": "Yingchao Du"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fkwq8a0e3ete9.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.02070",
  "fulltext_url": null,
  "id": "fkwq8a0e3ete9",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.02070",
  "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",
      "2204|Photocathodes and Microchannel Plates"
    ]
  ],
  "openalex": "W7207802088",
  "pdf_url": "https://arxiv.org/pdf/2609.02070",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fkwq8a0e3ete9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:16Z",
      "native_id": "2609.02070",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.02070"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.acc-ph",
      "subfield": "applied-instrumentation"
    }
  ],
  "title": "Rapid Mapping of Photocathode Quantum Efficiency: A Magnetized Electron Beam Imaging Approach",
  "title_text": "Rapid Mapping of Photocathode Quantum Efficiency: A Magnetized Electron Beam Imaging Approach",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:16Z",
  "url": "https://research.draconitic.com/paper/fkwq8a0e3ete9",
  "venue": "arXiv",
  "versions": []
}