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

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2007.04682v1.pdfWorking paper1.62 MBAdobe PDFView/Open
Title: An imaging refractometer for density fluctuation measurements in high energy density plasmas
Authors: Hare, JD
Burdiak, GC
Merlini, S
Chittenden, JP
Clayson, T
Crilly, AJ
Halliday, JWD
Russell, DR
Smith, RA
Stuart, N
Suttle, LG
Lebedev, SV
Item Type: Working Paper
Abstract: We report on a recently developed laser-based diagnostic which allows direct measurements of ray-deflection angles in one axis, whilst retaining imaging capabilities in the other axis. This allows us to measure the spectrum of angular deflections from a laser beam which passes though 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. The principle of this diagnostic is described, along with our specific experimental realisation. 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 0.05 and 34 mrad, corresponding to a dynamic range of over 500.
Issue Date: 9-Jul-2020
URI: http://hdl.handle.net/10044/1/80937
Publisher: arXiv
Copyright Statement: © 2020 The Author(s)
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
US Air Force
First Light Fusion Limited
U.S Department of Energy
U.S Department of Energy
Funder's Grant Number: EP/N013379/1
Keywords: physics.plasm-ph
Notes: 6 pages, 4 figures. Prepared as a contributed paper for HTPD December 2020, RSI special edition
Publication Status: Published
Appears in Collections:Physics
Plasma Physics