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No Access Submitted: 17 December 2020 Accepted: 22 February 2021 Published Online: 08 March 2021

  • An imaging refractometer for density fluctuation measurements in high energy density plasmas

Review of Scientific Instruments 92, 033521 (2021); https://doi.org/10.1063/5.0040919
J. D. Hare1,a), G. C. Burdiak2, S. Merlini1, J. P. Chittenden1, T. Clayson1, A. J. Crilly1, J. W. D. Halliday1, D. R. Russell1, R. A. Smith1, N. Stuart1, L. G. Suttle1, and S. V. Lebedev1,b)
more...View Affiliations
  • 1Blackett Laboratory, Imperial College, London SW7 2AZ, United Kingdom
  • 2First Light Fusion Ltd., 10 Oxford Industrial Park, Yarnton, Kidlington OX5 1QU, United Kingdom
  • b)Author to whom correspondence should be addressed:

    a)Current address: Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

    • Note: Paper published as part of the Special Topic on Proceedings of the 23rd Topical Conference on High-Temperature Plasma Diagnostics.

View Contributors
  • J. D. Hare
  • G. C. Burdiak
  • S. Merlini
  • J. P. Chittenden
  • T. Clayson
  • A. J. Crilly
  • J. W. D. Halliday
  • D. R. Russell
  • R. A. Smith
  • N. Stuart
  • L. G. Suttle
  • S. V. Lebedev
ABSTRACT
We report on a recently developed laser-probing diagnostic, which allows direct measurements of ray-deflection angles in one axis while retaining imaging capabilities in the other axis. This allows us to measure the spectrum of angular deflections from a laser beam, which passes through a turbulent high-energy-density plasma. This spectrum contains information about the density fluctuations within the plasma, which deflect the probing laser over a range of angles. We create synthetic diagnostics using ray-tracing to compare this new diagnostic with standard shadowgraphy and schlieren imaging approaches, which demonstrates the enhanced sensitivity of this new diagnostic over standard techniques. We present experimental data from turbulence behind a reverse shock in a plasma and demonstrate that this technique can measure angular deflections between 0.06 and 34 mrad, corresponding to a dynamic range of over 500.

ACKNOWLEDGMENTS

This work was supported in part by the Engineering and Physical Sciences Research Council (EPSRC) Grant No. EP/N013379/1 and by the U.S. Department of Energy (DOE) Award Nos. DE-F03-02NA00057, DE-SC-0001063, and DE-SC0020434.

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  1. © 2021 Author(s). Published under license by AIP Publishing.

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