{
  "abstract": "We report on the production of ultrahigh-charge relativistic electron beams and the development of a laser-wakefield acceleration platform at the LMJ facility. Making use of the kilojoule-class, sub-picosecond PETAL laser pulse focused onto a supersonic helium gas jet, electron beams carrying a total charge beyond 1 µC were generated, with energies up to ∼500 MeV. Given the ps-scale laser pulse duration, an on-target intensity approaching 10^19 W/cm^2 , and a plasma density reaching 2% of the critical density, electron energisation arises from a combination of self-modulated laser wakefield acceleration (SMLWFA) and direct laser acceleration (DLA). The resulting electron spectrum exhibits a Maxwellian-like distribution, characteristic of this mixed SMLWFA/DLA regime. The total energy carried by the electron beam is estimated to be up to 17 J, within a sub-ps duration. A broadband Joule-level photon beam was also produced by Bremsstrahlung, demonstrating the potential for future applications. Experimental results are supported by start-to-end numerical simulations, including 3-D particle-in-cell and Monte-Carlo particle transport calculations. These findings pave the way for applications requiring high-charge electron beams, including the generation of high-power secondary radiation or particle sources. The use of these beams to probe matter in high-energy density states driven by the nanosecond-duration LMJ beams represents another promising avenue.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.16459",
  "author_total": 41,
  "authors": [
    {
      "name": "B Mahieu"
    },
    {
      "name": "L Ribotte"
    },
    {
      "name": "W Cayzac"
    },
    {
      "name": "G Boutoux"
    },
    {
      "name": "R Parreault"
    },
    {
      "name": "J Gastineau"
    },
    {
      "name": "E Lamoine"
    },
    {
      "name": "F Audo"
    },
    {
      "name": "R Babjak"
    },
    {
      "name": "D Batani"
    },
    {
      "name": "N Blanchot"
    },
    {
      "name": "J L Bourgade"
    },
    {
      "name": "M Brochier"
    },
    {
      "name": "T Caillaud"
    },
    {
      "name": "P Canel"
    },
    {
      "name": "S Cavaro"
    },
    {
      "name": "C Chappuis"
    },
    {
      "name": "S Debesset"
    },
    {
      "name": "R Diaz"
    },
    {
      "name": "E d'Humières"
    },
    {
      "name": "W Duchastenier"
    },
    {
      "name": "R Du Jeu"
    },
    {
      "name": "A Duval"
    },
    {
      "name": "B Etchessahar"
    },
    {
      "name": "M Ferri"
    },
    {
      "name": "M Garandeau"
    },
    {
      "name": "L Gremillet"
    },
    {
      "name": "V Hénot"
    },
    {
      "name": "E Journot"
    },
    {
      "name": "J C Kieffer"
    },
    {
      "name": "I Lantuéjoul"
    },
    {
      "name": "L Le Déroff"
    },
    {
      "name": "N Lemos"
    },
    {
      "name": "C Rousseaux"
    },
    {
      "name": "F Scol"
    },
    {
      "name": "K Ta Phuoc"
    },
    {
      "name": "W Vaillant"
    },
    {
      "name": "B Vauzour"
    },
    {
      "name": "M Vranic"
    },
    {
      "name": "X Davoine"
    },
    {
      "name": "F Albert"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0sy4gp6at6v9d.bib",
  "cited_by": 0,
  "doi": null,
  "fulltext_url": null,
  "id": "0sy4gp6at6v9d",
  "issns": [],
  "landing_url": "https://hal.science/hal-05737327v1",
  "language": "en",
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.phys"
    ],
    [
      "hal",
      "2.phys.phys.phys-plasm-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://hal.science/hal-05737327/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0sy4gp6at6v9d.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:27Z",
      "native_id": "hal-05737327",
      "source": "hal",
      "url": "https://hal.science/hal-05737327v1"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "hal:2.phys.phys.phys-plasm-ph",
      "subfield": "plasma"
    }
  ],
  "title": "Microcoulomb-level electron beam and multi-Joule hard X-rays driven by a high-efficiency laser-plasma accelerator",
  "title_text": "Microcoulomb-level electron beam and multi-Joule hard X-rays driven by a high-efficiency laser-plasma accelerator",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:27Z",
  "url": "https://research.draconitic.com/paper/0sy4gp6at6v9d",
  "venue": "HAL",
  "versions": []
}