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

Abstract

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 deuterium-tritium plasma during the stagnation stage of inertial confinement fusion 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];  [2]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87544 (United States)
  2. Livermore National Laboratory, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
22392277
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 85; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ALGORITHMS; APERTURES; DEUTERIUM; IMPLOSIONS; INERTIAL CONFINEMENT; NEUTRON SOURCES; PLASMA; RESOLUTION; TRITIUM; US NATIONAL IGNITION FACILITY

Citation Formats

Volegov, P. L., E-mail: volegov@lanl.gov, Danly, C. R., Guler, N., Merrill, F. E., Wilde, C. H., and Fittinghoff, D. N. Self characterization of a coded aperture array for neutron source imaging. United States: N. p., 2014. Web. doi:10.1063/1.4902978.
Volegov, P. L., E-mail: volegov@lanl.gov, Danly, C. R., Guler, N., Merrill, F. E., Wilde, C. H., & Fittinghoff, D. N. Self characterization of a coded aperture array for neutron source imaging. United States. https://doi.org/10.1063/1.4902978
Volegov, P. L., E-mail: volegov@lanl.gov, Danly, C. R., Guler, N., Merrill, F. E., Wilde, C. H., and Fittinghoff, D. N. 2014. "Self characterization of a coded aperture array for neutron source imaging". United States. https://doi.org/10.1063/1.4902978.
@article{osti_22392277,
title = {Self characterization of a coded aperture array for neutron source imaging},
author = {Volegov, P. L., E-mail: volegov@lanl.gov and Danly, C. R. and Guler, N. and Merrill, F. E. and Wilde, C. H. and Fittinghoff, D. N.},
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 deuterium-tritium plasma during the stagnation stage of inertial confinement fusion 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},
url = {https://www.osti.gov/biblio/22392277}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 12,
volume = 85,
place = {United States},
year = {2014},
month = {12}
}

Works referenced in this record:

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Fuel gain exceeding unity in an inertially confined fusion implosion
journal, February 2014


Progress toward the development and testing of source reconstruction methods for NIF neutron imaging
journal, October 2010


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Point design targets, specifications, and requirements for the 2010 ignition campaign on the National Ignition Facility
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Cryogenic thermonuclear fuel implosions on the National Ignition Facility
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Simultaneous usage of pinhole and penumbral apertures for imaging small scale neutron sources from inertial confinement fusion experiments
journal, October 2012


Nuclear imaging of the fuel assembly in ignition experiments
journal, May 2013


Review of the National Ignition Campaign 2009-2012
journal, February 2014


Neutron source reconstruction from pinhole imaging at National Ignition Facility
journal, February 2014


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Geometry of the Cramer-Rao bound
conference, January 1992


Theory of Statistics.
journal, January 1996


Works referencing / citing this record:

Dynamic high energy density plasma environments at the National Ignition Facility for nuclear science research
journal, February 2018