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Title: Self characterization of a coded aperture array for neutron source imaging

The neutron imaging system at the National Ignition Facility (NIF) is an important diagnostic tool for measuring the two-dimensional size and shape of the neutrons produced in the burning DT plasma during the stagnation stage of ICF implosions. Since the neutron source is small (~100 μm) and neutrons are deeply penetrating (>3 cm) in all materials, the apertures used to achieve the desired 10-μm resolution are 20-cm long, triangular tapers machined in gold foils. These gold foils are stacked to form an array of 20 apertures for pinhole imaging and three apertures for penumbral imaging. These apertures must be precisely aligned to accurately place the field of view of each aperture at the design location, or the location of the field of view for each aperture must be measured. In this paper we present a new technique that has been developed for the measurement and characterization of the precise location of each aperture in the array. We present the detailed algorithms used for this characterization and the results of reconstructed sources from inertial confinement fusion implosion experiments at NIF.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [1] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Spectral Sciences, Inc., Burlington, MA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-743998; LA-UR-14-24988
Journal ID: ISSN 0034-6748; TRN: US1801015
Grant/Contract Number:
AC52-07NA27344; AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 85; 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); Los Alamos National Lab. (LANL), Los Alamos, NM (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; 22 GENERAL STUDIES OF NUCLEAR REACTORS; 70 PLASMA PHYSICS AND FUSION; Neutron sources; Neutrons; Image sensors; Neutron imaging; Image detection systems; neutron imaging, pinhole, penumbra
OSTI Identifier:
1417271
Alternate Identifier(s):
OSTI ID: 1226610; OSTI ID: 1473792

Volegov, P. L., Danly, C. R., Fittinghoff, D. N., Guler, N., Merrill, F. E., and Wilde, C. H.. Self characterization of a coded aperture array for neutron source imaging. United States: N. p., Web. doi:10.1063/1.4902978.
Volegov, P. L., Danly, C. R., Fittinghoff, D. N., Guler, N., Merrill, F. E., & Wilde, C. H.. Self characterization of a coded aperture array for neutron source imaging. United States. doi:10.1063/1.4902978.
Volegov, P. L., Danly, C. R., Fittinghoff, D. N., Guler, N., Merrill, F. E., and Wilde, C. H.. 2014. "Self characterization of a coded aperture array for neutron source imaging". United States. doi:10.1063/1.4902978. https://www.osti.gov/servlets/purl/1417271.
@article{osti_1417271,
title = {Self characterization of a coded aperture array for neutron source imaging},
author = {Volegov, P. L. and Danly, C. R. and Fittinghoff, D. N. and Guler, N. and Merrill, F. E. and Wilde, C. H.},
abstractNote = {The neutron imaging system at the National Ignition Facility (NIF) is an important diagnostic tool for measuring the two-dimensional size and shape of the neutrons produced in the burning DT plasma during the stagnation stage of ICF implosions. Since the neutron source is small (~100 μm) and neutrons are deeply penetrating (>3 cm) in all materials, the apertures used to achieve the desired 10-μm resolution are 20-cm long, triangular tapers machined in gold foils. These gold foils are stacked to form an array of 20 apertures for pinhole imaging and three apertures for penumbral imaging. These apertures must be precisely aligned to accurately place the field of view of each aperture at the design location, or the location of the field of view for each aperture must be measured. In this paper we present a new technique that has been developed for the measurement and characterization of the precise location of each aperture in the array. We present the detailed algorithms used for this characterization and the results of reconstructed sources from inertial confinement fusion implosion experiments at NIF.},
doi = {10.1063/1.4902978},
journal = {Review of Scientific Instruments},
number = 12,
volume = 85,
place = {United States},
year = {2014},
month = {12}
}