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Title: Optimizing neutron imaging line of sight locations for maximizing sampling of the cold fuel density in inertial confinement fusion implosions at the National Ignition Facility

Journal Article · · Review of Scientific Instruments
DOI:https://doi.org/10.1063/1.5038815· OSTI ID:1482000
 [1];  [1];  [1]; ORCiD logo [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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We report that neutron imaging provides a ready measurement of the shape of the “hot spot” core of an inertial confinement fusion implosion. The 14-MeV neutrons emitted by deuterium-tritium reactions are imaged at the National Ignition Facility using a pinhole array onto a scintillator, and the images are recorded on a camera. By changing the gate time of the camera, lower energy neutrons, downscattered by the cold fuel surrounding the hot spot, are recorded. The cold fuel density can be reconstructed using the two images. The kinematics of the scattering coupled with the scattering cross sections restrict the angular extent of the cold fuel sampled, with the backside of the implosion not being sampled at all. This work demonstrates the limited region of the cold fuel measured by the current line of sight (40%). Finally, at completion of the three planned lines of sight, 79% of the cold fuel will be sampled.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1482000
Alternate ID(s):
OSTI ID: 1478679
Report Number(s):
LA-UR-18-23951
Journal Information:
Review of Scientific Instruments, Vol. 89, Issue 10; Conference: High Temperature Plasma Diagnostics ; 2018-04-16 - 2018-04-19 ; San Diego, California, United States; ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

References (10)

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Three-dimensional reconstruction of neutron, gamma-ray, and x-ray sources using spherical harmonic decomposition journal November 2017
Consequences of Neutron-Proton Mass Difference in the Kinematics of Neutron-Proton Scattering journal February 1964
The National Ignition Facility Diagnostic Set at the Completion of the National Ignition Campaign, September 2012 journal February 2016
Aperture design for the third neutron and first gamma-ray imaging systems for the National Ignition Facility journal October 2018
Development of the indirect‐drive approach to inertial confinement fusion and the target physics basis for ignition and gain journal November 1995
The experimental plan for cryogenic layered target implosions on the National Ignition Facility—The inertial confinement approach to fusion journal May 2011
The National Ignition Facility: enabling fusion ignition for the 21st century journal November 2004

Cited By (1)

Nuclear diagnostics for Inertial Confinement Fusion (ICF) plasmas journal January 2020

Figures / Tables (5)

FIG. 1(p. 3)figure FIG. 1
FIG. 2(p. 4)figure FIG. 2
FIG. 3(p. 4)figure FIG. 3
FIG. 4(p. 5)figure FIG. 4
FIG. 5(p. 5)figure FIG. 5

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