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.

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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