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31 August 2015 Complete time-resolved polarimetry of scattered light at the National Ignition Facility
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Abstract
The 3ω scattered light polarimetry diagnostic in the 30° incidence cone backscatter diagnostic at the National Ignition Facility (NIF) is being upgraded to measure the full time-resolved Stokes vector. Previously, the diagnostic had a single channel capable of diagnosing the time-integrated balance of the horizontal and vertical polarizations. Two additional channels were added – one that measures the balance of the 45° and 135° projections, and another that measures the right- and left-circular polarizations – and together the three complete the Stokes vector measurement. A division-of-aperture scheme is employed in which three nearby portions of the near field are sampled simultaneously. Time resolution is obtained by relaying an image of the measured regions onto a set of fibers coupled to diodes. The new diagnostic will be capable of measuring scattered light signals <≈ .1GW with ≈ 120ps time resolution. This will allow more rigorous evaluation of earlier indications that backscatter polarization can serve as a quantitative diagnostic of crossed-beam energy transfer in indirect-drive inertial confinement fusion experiments. It will also be used to diagnose Faraday rotation induced by magnetic fields in collisionless shock and turbulent dynamo experiments later this year.
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David Turnbull, Shannon Ayers, Perry Bell, Robert Chow, Gene Frieders, Robin L. Hibbard, Pierre Michel, Joseph E. Ralph, James S. Ross, Joel R. Stanley, James L. Vickers, Ziad M. Zeid, and John D. Moody "Complete time-resolved polarimetry of scattered light at the National Ignition Facility", Proc. SPIE 9591, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion IV, 959103 (31 August 2015); https://doi.org/10.1117/12.2188787
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