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Proceedings Paper

The 27.3 meter neutron time-of-flight system for the National Ignition Facility
Author(s): G. P. Grim; G. L. Morgan; R. Aragonez; T. N. Archuleta; D. E. Bower; C. R. Danly; O. B. Drury; J. M. Dzenitis; V. E. Fatherley; B. Felker; D. N. Fittinghoff; N. Guler; F. E. Merrill; J. A. Oertel; C. H. Wilde; M. D. Wilke
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Paper Abstract

One of the scientific goals of the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory, Livermore CA, is to obtain thermonuclear ignition by compressing 2.2 mm diameter capsules filed with deuterium and tritium to densities approaching 1000 g/cm3 and temperatures in excess of 4 keV. Thefusion reaction d + t → n + a results in a 14.03 MeV neutron providing a source of diagnostic particles to characterize the implosion. The spectrum of neutrons emanating from the assembly may be used to infer the fusion yield, plasma ion temperature, and fuel areal density, all key diagnostic quantities of implosion quality. The neutron time-of-flight (nToF) system co-located along the Neutron Imaging System line-of-site, (NIToF), is a set of 4 scintillation detectors located approximately 27.3 m from the implosion source. Neutron spectral information is inferred using arrival time at the detector. The NIToF system is described below, including the hardware elements, calibration data, analysis methods, and an example of its basic performance characteristics.

Paper Details

Date Published: 26 September 2013
PDF: 12 pages
Proc. SPIE 8854, Penetrating Radiation Systems and Applications XIV, 88540G (26 September 2013); doi: 10.1117/12.2030170
Show Author Affiliations
G. P. Grim, Los Alamos National Lab. (United States)
G. L. Morgan, Los Alamos National Lab. (United States)
R. Aragonez, Los Alamos National Lab. (United States)
T. N. Archuleta, Los Alamos National Lab. (United States)
D. E. Bower, Lawrence Livermore National Lab. (United States)
C. R. Danly, Los Alamos National Lab. (United States)
O. B. Drury, Lawrence Livermore National Lab. (United States)
J. M. Dzenitis, Lawrence Livermore National Lab. (United States)
V. E. Fatherley, Los Alamos National Lab. (United States)
B. Felker, Lawrence Livermore National Lab. (United States)
D. N. Fittinghoff, Lawrence Livermore National Lab. (United States)
N. Guler, Los Alamos National Lab. (United States)
F. E. Merrill, Los Alamos National Lab. (United States)
J. A. Oertel, Los Alamos National Lab. (United States)
C. H. Wilde, Los Alamos National Lab. (United States)
M. D. Wilke, Los Alamos National Lab. (United States)


Published in SPIE Proceedings Vol. 8854:
Penetrating Radiation Systems and Applications XIV
Gary P. Grim; H. Bradford Barber, Editor(s)

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