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Simpson R, Christensen K, Danly C, et al. Demonstration of a time-integrated short line of sight neutron imaging system for inertial confinement fusion. Rev Sci Instrum. 2015;86(12):125112doi: 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. (2015). Demonstration of a time-integrated short line of sight neutron imaging system for inertial confinement fusion. The Review of scientific instruments, 86(12), 125112. https://doi.org/10.1063/1.4938543
Simpson, R, et al. "Demonstration of a time-integrated short line of sight neutron imaging system for inertial confinement fusion." The Review of scientific instruments vol. 86,12 (2015): 125112. doi: https://doi.org/10.1063/1.4938543
Simpson R, Christensen K, Danly C, Fatherley VE, Fittinghoff D, Grim GP, Izumi N, Jedlovec D, Merrill FE, Skulina K, Volegov P, Wilde C. Demonstration of a time-integrated short line of sight neutron imaging system for inertial confinement fusion. Rev Sci Instrum. 2015 Dec;86(12):125112. doi: 10.1063/1.4938543. PMID: 26724078.
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Rev Sci Instrum. 2015 Dec;86(12):125112. doi: 10.1063/1.4938543.

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

The Review of scientific instruments

R Simpson, K Christensen, C Danly, V E Fatherley, D Fittinghoff, G P Grim, N Izumi, D Jedlovec, F E Merrill, K Skulina, P Volegov, C Wilde

Affiliations

  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  2. Lawrence Livermore National Laboratory, Livermore, California 94550, USA.

PMID: 26724078 DOI: 10.1063/1.4938543

Abstract

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. 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.

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