期刊
REVIEW OF SCIENTIFIC INSTRUMENTS
卷 85, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4890537
关键词
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资金
- Department of Energy National Nuclear Security Administration [DE-NA0001944]
- University of Rochester
- New York State Energy Research and Development Authority
- U.S. Department of Energy, National Nuclear Security Administration [DE-AC52-07NA27344]
- DOE [LLNL-PROC-655392]
In laser-driven inertial confinement fusion, hot electrons can preheat the fuel and prevent fusion-pellet compression to ignition conditions. Measuring the hot-electron population is key to designing an optimized ignition platform. The hot electrons in these high-intensity, laser-driven experiments, created via laser-plasma interactions, can be inferred from the bremsstrahlung generated by hot electrons interacting with the target. At the National Ignition Facility (NIF) [G. H. Miller, E. I. Moses, and C. R. Wuest, Opt. Eng. 43, 2841 (2004)], the filter-fluorescer x-ray (FFLEX) diagnostic-a multichannel, hard x-ray spectrometer operating in the 20-500 keV range-has been upgraded to provide fully time-resolved, absolute measurements of the bremsstrahlung spectrum with similar to 300 ps resolution. Initial time-resolved data exhibited significant background and low signal-to-noise ratio, leading to a redesign of the FFLEX housing and enhanced shielding around the detector. The FFLEX x-ray sensitivity was characterized with an absolutely calibrated, energy-dispersive high-purity germanium detector using the high-energy x-ray source at NSTec Livermore Operations over a range of K-shell fluorescence energies up to 111 keV (U K-beta). The detectors impulse response function was measured in situ on NIF short-pulse (similar to 90 ps) experiments, and in off-line tests. (C) 2014 AIP Publishing LLC.
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