{
  "abstract": "Combining the high peak brilliance and short pulse duration of free-electron lasers (FELs) with the high repetition rate of diffraction-limited storage rings (DLSRs) is a promising direction for accelerator light sources. In this paper, we propose a dual-ring light source concept that, at MHz repetition rates, delivers pulses with a pulse durations and peak power intermediate between those of FELs and DLSRs. Such a light source can be realized as an upgrade of an existing DLSR by adding an isochronous ring equipped with transverse gradient undulators (TGUs) and connecting the two rings via bunch compression and decompression systems. We present the conceptual layout and show that bunch compression shortens the electron bunches to ps-scale durations; multi-turn radiation in the isochronous ring raises the repetition rate to 1.36 MHz from a single TGU; and the long TGUs enhance the brilliance, delivering $10^{7}$--$10^{9}$ photons per pulse across the soft and hard X-ray range, an increase of 2--4 orders of magnitude over the original DLSR. The dual-ring light source thus provides a cost-effective route to MHz FEL operation based on existing storage-ring infrastructure, combining the high repetition rate of a DLSR with the short pulses and high brilliance of a linac-driven FEL.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.12397",
  "author_total": 5,
  "authors": [
    {
      "name": "Fancong Zeng"
    },
    {
      "name": "Yi Jiao"
    },
    {
      "name": "Weihang Liu"
    },
    {
      "name": "Yu Zhao"
    },
    {
      "name": "Weilun Qin"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/eapxztpyke0wg.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.12397",
  "fulltext_url": null,
  "id": "eapxztpyke0wg",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.12397",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2611.12397",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/eapxztpyke0wg.ris",
  "sources": [
    {
      "first_seen": "2026-11-10T06:21:23Z",
      "native_id": "2611.12397",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.12397"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.acc-ph",
      "subfield": "applied-instrumentation"
    }
  ],
  "title": "Physics design of a dual-ring light source toward MHz-rate free-electron laser radiation",
  "title_text": "Physics design of a dual-ring light source toward MHz-rate free-electron laser radiation",
  "type": "preprint",
  "updated_at": "2026-11-10T06:21:23Z",
  "url": "https://research.draconitic.com/paper/eapxztpyke0wg",
  "venue": "arXiv",
  "versions": []
}