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Monochromatic Talbot-Lau X-ray Imaging Diagnostics

ORAL

Abstract

Talbot-Lau X-ray Interferometry is a refraction-based imaging technique that can characterize high electron density gradients in High Energy Density (HED) experiments through phase-contrast methods. In the Talbot-Lau X-ray Deflectometry (TXD) mode, the diagnostic delivers simultaneous attenuation, dark-field, and phase-change measurements from a single Moiré image. TXD diagnostic platforms have been deployed at the Multi-TeraWatt and Omega EP lasers using laser-produced x-ray backlighters. To further improve diagnostic performance and data accuracy, monochromatic TXD has been established using 8 keV multilayer mirrors. Copper foil and wire targets were irradiated at 1014-15 W/cm2, exploring the effect of laser pulse length (~10-80 ps) and backlighter target configuration on spatial resolution and Moiré fringe contrast. Copper foils irradiated at 80° delivered <6 µm spatial resolution with increased fringe contrast (>30%) in comparison with previous results using standard TXD diagnostics (11-24%). Additionally, advanced data post-processing tools have been developed to enhance TXD diagnostic capabilities. Instrumental and experimental limitations for monochromatic TXD diagnostics in the laser environment will be presented and discussed.

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Presenters

  • Maria Pia Valdivia Leiva

    University of California, San Diego, Center for Energy Research, University of California San Diego, San Diego, California, USA, University of California San Diego

Authors

  • Maria Pia Valdivia Leiva

    Johns Hopkins University

  • Victorien Bouffetier

    Eu-XFEL, European XFEL, European XFEL GmbH, Schenefeld, Germany

  • Gabriel Perez-Callejo

    Departamento de Física Teórica, Atómica y Óptica, Universidad de Valladolid, Valladolid, Spain

  • Christian Stoeckl

    University of Rochester, Laboratory for Laser Energetics, U. of Rochester, Laboratory for Laser Energetics, University of Rochester

  • T. Filkins

    LLE, Lab for Laser Energetics, Laboratory for Laser Energetics, University of Rochester, Rochester, New York, USA, University of Rochester, Laboratory for Laser Energetics, University of Rochester

  • Chad Mileham

    Laboratory for Laser Energetics, U. of Rochester, Laboratory for Laser Energetics, University of Rochester, Rochester, New York, USA

  • Mark Romanofsky

    Laboratory for Laser Energetics, University of Rochester, Rochester, New York, USA

  • Ildar Begishev

    Laboratory for Laser Energetics, University of Rochester, Rochester, New York, USA

  • Alexis Casner

    CEA CESTA

  • Dan Stutman

    European XFEL GmbH, Schenefeld, Germany

  • Maria Pia Valdivia Leiva

    University of California, San Diego, Center for Energy Research, University of California San Diego, San Diego, California, USA, University of California San Diego