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Title: Demonstration of a time-integrated short line of sight neutron imaging system for inertial confinement fusion

The Neutron Imaging System (NIS) is an important diagnostic for understanding implosions of deuterium-tritium capsules at the National Ignition Facility. While the detectors for the existing system must be positioned 28 m from the source to produce sufficient imaging magnification and resolution, recent testing of a new short line of sight neutron imaging system has shown sufficient resolution to allow reconstruction of the source image with quality similar to that of the existing NIS on a 11.6 m line of sight. The new system used the existing pinhole aperture array and a stack of detectors composed of 2 mm thick high-density polyethylene converter material followed by an image plate. In these detectors, neutrons enter the converter material and interact with protons, which recoil and deposit energy within the thin active layer of the image plate through ionization losses. The described system produces time-integrated images for all neutron energies passing through the pinhole. Here, we present details of the measurement scheme for this novel technique to produce energy-integrated neutron images as well as source reconstruction results from recent experiments at NIF.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [1] ;  [2] ;  [1] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-732946
Journal ID: ISSN 0034-6748; RSINAK; 884463
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 86; Journal Issue: 12; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Lasers; neutron imaging; national ignition facility; inertial confinement fusion
OSTI Identifier:
1477154
Alternate Identifier(s):
OSTI ID: 1234025

Simpson, R., Christensen, K., Danly, C., Fatherley, V. E., Fittinghoff, D., Grim, G. P., Izumi, N., Jedlovec, D., Merrill, F. E., Skulina, K., Volegov, P., and Wilde, C.. Demonstration of a time-integrated short line of sight neutron imaging system for inertial confinement fusion. United States: N. p., Web. doi:10.1063/1.4938543.
Simpson, R., Christensen, K., Danly, C., Fatherley, V. E., Fittinghoff, D., Grim, G. P., Izumi, N., Jedlovec, D., Merrill, F. E., Skulina, K., Volegov, P., & Wilde, C.. Demonstration of a time-integrated short line of sight neutron imaging system for inertial confinement fusion. United States. doi:10.1063/1.4938543.
Simpson, R., Christensen, K., Danly, C., Fatherley, V. E., Fittinghoff, D., Grim, G. P., Izumi, N., Jedlovec, D., Merrill, F. E., Skulina, K., Volegov, P., and Wilde, C.. 2015. "Demonstration of a time-integrated short line of sight neutron imaging system for inertial confinement fusion". United States. doi:10.1063/1.4938543. https://www.osti.gov/servlets/purl/1477154.
@article{osti_1477154,
title = {Demonstration of a time-integrated short line of sight neutron imaging system for inertial confinement fusion},
author = {Simpson, R. and Christensen, K. and Danly, C. and Fatherley, V. E. and Fittinghoff, D. and Grim, G. P. and Izumi, N. and Jedlovec, D. and Merrill, F. E. and Skulina, K. and Volegov, P. and Wilde, C.},
abstractNote = {The Neutron Imaging System (NIS) is an important diagnostic for understanding implosions of deuterium-tritium capsules at the National Ignition Facility. While the detectors for the existing system must be positioned 28 m from the source to produce sufficient imaging magnification and resolution, recent testing of a new short line of sight neutron imaging system has shown sufficient resolution to allow reconstruction of the source image with quality similar to that of the existing NIS on a 11.6 m line of sight. The new system used the existing pinhole aperture array and a stack of detectors composed of 2 mm thick high-density polyethylene converter material followed by an image plate. In these detectors, neutrons enter the converter material and interact with protons, which recoil and deposit energy within the thin active layer of the image plate through ionization losses. The described system produces time-integrated images for all neutron energies passing through the pinhole. Here, we present details of the measurement scheme for this novel technique to produce energy-integrated neutron images as well as source reconstruction results from recent experiments at NIF.},
doi = {10.1063/1.4938543},
journal = {Review of Scientific Instruments},
number = 12,
volume = 86,
place = {United States},
year = {2015},
month = {12}
}