Improved hard x-ray (50-80 keV) imaging of hohlraum implosion experiments at the National Ignition Facility
2016
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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