19 September 2016 Improved hard x-ray (50-80 keV) imaging of hohlraum implosion experiments at the National Ignition Facility
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Abstract
We recently designed, built and commissioned a new pinhole / filter assembly for the equatorial hard x-ray imager (eHXI) at the National Ignition Facility (NIF). In this paper we describe the design and metrology of the new diagnostic as well as the spectral and spatial response of the hard x-ray detector. The new eHXI assembly has improved the photon collection efficiency along with spectral and spatial resolution by making use of 1D imaging channels and various hard x-ray filters. In addition we added a Ross pair filter set for Au K-alpha emission (67-69 keV). The new eHXI design will improve our understanding of the sourcing of hot electrons, generated in laser-plasma-instabilities, along the vertical hohlraum axis. This information is an important input for simulating and eventually limiting the DT fuel preheat in ICF implosions.
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B. Bachmann, B. Bachmann, R. Chow, R. Chow, N. E. Palmer, N. E. Palmer, M. Hoover, M. Hoover, E. Huffman, E. Huffman, J. J. Lee, J. J. Lee, E. Romano, E. Romano, C. Kumar, C. Kumar, R. D Hulbert, R. D Hulbert, F. Albert, F. Albert, E. L. Dewald, E. L. Dewald, L. Divol, L. Divol, M. Hohenberger, M. Hohenberger, O. L. Landen, O. L. Landen, A. Warrick, A. Warrick, T. Döppner, T. Döppner, "Improved hard x-ray (50-80 keV) imaging of hohlraum implosion experiments at the National Ignition Facility", Proc. SPIE 9966, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion V, 996605 (19 September 2016); doi: 10.1117/12.2238452; https://doi.org/10.1117/12.2238452
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