{
  "abstract": "In this paper, we describe a novel technique for inferring electron density in laser plasmas from proton-radiography data. Proton radiography is primarily a diagnostic for imaging electromagnetic field structures in such plasmas. In the presence of strong field gradients, `caustic' features arise and are broadened by the process of collisional scattering between the imaging protons and the plasma. This effect has a well defined density dependence, allowing for a robust measurement of electron number density. We validate the method on data from the turbulent-dynamo experiments performed at the Omega laser facility (with electron densities in the range of ${\\sim}10^{20}\\,\\mathrm{cm^{-3}}$), achieving good agreement with values obtained from Thomson scattering, x-ray imaging and simulations. This research enables one of the most robust techniques for measuring electromagnetic fields on laser-plasma experiments to simultaneously provide density measurements along the same line of sight, improving our ability to diagnose such plasmas.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.22605",
  "author_total": 4,
  "authors": [
    {
      "name": "Joshua T. Y. Chu"
    },
    {
      "name": "Gianluca Gregori"
    },
    {
      "name": "Petros Tzeferacos"
    },
    {
      "name": "Archie F. A. Bott"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/aes6ndd7a9mr7.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.22605",
  "fulltext_url": null,
  "id": "aes6ndd7a9mr7",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.22605",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.plasm-ph"
    ],
    [
      "openalex",
      "3106|Laser-Plasma Interactions and Diagnostics"
    ]
  ],
  "openalex": "W7222963834",
  "pdf_url": "https://arxiv.org/pdf/2610.22605",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/aes6ndd7a9mr7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2610.22605",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.22605"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.plasm-ph",
      "subfield": "plasma"
    }
  ],
  "title": "Measuring electron density and electromagnetic fields in low-density laser-driven plasmas using proton radiography",
  "title_text": "Measuring electron density and electromagnetic fields in low-density laser-driven plasmas using proton radiography",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/aes6ndd7a9mr7",
  "venue": "arXiv",
  "versions": []
}