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Proceedings Paper

Development of the real-time neutron activation diagnostic system for NIF
Author(s): Jaben R. Root; Donald R. Jedlovec; Ellen R. Edwards; Charles B. Yeamans; Tony Golod; Jose Hernandez; Phil Adams; Gordon Brunton
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Paper Abstract

The National Ignition Facility (NIF) is one of the highest fluence neutron sources provided by the nuclear fusion of deuterium and tritium nuclei. One of the resultant products is 14.1 MeV neutrons which provide key information to the conditions in which they were formed. The degree of polar and azimuthal symmetry of the neutron flux is a key metric for the performance of the capsule, thus a spatially-resolved measurement of the neutron distribution is critical. Implementing a suite of 48 lanthanum bromide detectors with zirconium activation samples around the target chamber has been developed to measure the neutron distribution. The system provides near real-time time estimates of the neutron fluence distribution. It is designed to operate over six orders of magnitude of neutron yield, providing overall yield estimates precise to 2%. The system is designed to operate continuously through the NIF shot cycles, accommodating high data rates. We will describe the nuclear counting system, data acquisition and archiving, analysis, and yield distribution results for some NIF high yield shots. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. LLNL-CONF-736439

Paper Details

Date Published: 26 September 2017
PDF: 6 pages
Proc. SPIE 10390, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion VI, 103900J (26 September 2017); doi: 10.1117/12.2274343
Show Author Affiliations
Jaben R. Root, Lawrence Livermore National Lab. (United States)
Donald R. Jedlovec, Lawrence Livermore National Lab. (United States)
Ellen R. Edwards, Lawrence Livermore National Lab. (United States)
Charles B. Yeamans, Lawrence Livermore National Lab. (United States)
Tony Golod, Lawrence Livermore National Lab. (United States)
Jose Hernandez, Lawrence Livermore National Lab. (United States)
Phil Adams, Lawrence Livermore National Lab. (United States)
Gordon Brunton, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 10390:
Target Diagnostics Physics and Engineering for Inertial Confinement Fusion VI
Jeffrey A. Koch; Gary P. Grim, Editor(s)

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