Direct Measurement of bulk temperature using Inelastic X-ray Scattering at X-ray Free Electron Lasers.

ORAL

Abstract

Direct and accurate measurements of thermodynamic and transport properties are essential for understanding the behavior of extreme states of matter. While X-ray diffraction measurements at large laser facilities or Free Electron Lasers, such as the LCLS, have allowed \textit{in situ} measurement of structure and density, however, the direct measurement of bulk temperature remains a challenge. Here, we present the development of a platform using inelastic X-ray scattering in a Johann geometry to measure temperature by the use of the principle of detailed balance. A proof-of-principle experiment was conducted at the HED beamline at the European XFEL on resistively heated single crystal diamond at 500 K. This technique was then combined with a cryogenic jet of argon compressed with a short pulse laser at the MEC endstation at LCLS, allowing the direct measurement of the temperature of laser compressed matter.

–

Authors

  • Adrien Descamps

    • SLAC National Accelerator Laboratory, Menlo Park, 94025, California, USA

  • Benjamin Ofori-Okai

    • SLAC
    • SLAC National Accelerator Laboratory, Menlo Park, 94025, California, USA

  • Luke Fletcher

    • SLAC National Accelerator Laboratory
    • SLAC
    • SLAC National Accelerator Laboratory, Menlo Park, 94025, California, USA

  • Jerome Hastings

    • SLAC National Accelerator Laboratory, Menlo Park, 94025, California, USA

  • Ulf Zastrau

    • European XFEL
    • European X-Ray Free-Electron Laser Facility GmbH

  • Gianluca Gregori

    • University of Oxford
    • Department of Physics, Clarendon Laboratory, Parks Road, University of Oxford, OX1 3PU, UK
    • Department of Physics, University of Oxford

  • Siegfried Glenzer

    • SLAC National Accelerator Laboratory
    • Stanford Univ
    • SLAC
    • SLAC National Accelerator Laboratory, Menlo Park, 94025, California, USA

  • Emma McBride

    • SLAC National Accelerator Laboratory, Menlo Park, 94025, California, USA