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Title: Using multiple neutron time of flight detectors to determine the hot spot velocity

Abstract

An important diagnostic value of a shot at the National Ignition Facility is the resultant center-of-mass motion of the imploding capsule. This residual velocity reduces the efficiency of converting laser energy into plasma temperature. A new analysis method extracts the effective hot spot motion by using information from multiple neutron time-of-flight (nToF) lines-of-sight (LoSs). This technique fits a near Gaussian spectrum to the nToF scope traces and overcomes reliance on models to relate the plasma temperature to the mean energy of the emitted neutrons. This method requires having at least four nToF LoSs. The results of this analysis will be compared to an approach where each LoS is analyzed separately and a model is employed to infer the mean energy of the emitted neutrons

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1545515
Alternate Identifier(s):
OSTI ID: 1477910
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Conference: 22. Topical Conference on High-Temperature Plasma Diagnostics, San Diego, CA (United States), Apr. 2018; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 47 OTHER INSTRUMENTATION

Citation Formats

Hatarik, R., Nora, R. C., Spears, B. K., Eckart, M. J., Grim, G. P., Hartouni, E. P., Moore, A. S., and Schlossberg, D. J. Using multiple neutron time of flight detectors to determine the hot spot velocity. United States: N. p., 2018. Web. doi:10.1063/1.5039372.
Hatarik, R., Nora, R. C., Spears, B. K., Eckart, M. J., Grim, G. P., Hartouni, E. P., Moore, A. S., & Schlossberg, D. J. Using multiple neutron time of flight detectors to determine the hot spot velocity. United States. doi:10.1063/1.5039372.
Hatarik, R., Nora, R. C., Spears, B. K., Eckart, M. J., Grim, G. P., Hartouni, E. P., Moore, A. S., and Schlossberg, D. J. Wed . "Using multiple neutron time of flight detectors to determine the hot spot velocity". United States. doi:10.1063/1.5039372. https://www.osti.gov/servlets/purl/1545515.
@article{osti_1545515,
title = {Using multiple neutron time of flight detectors to determine the hot spot velocity},
author = {Hatarik, R. and Nora, R. C. and Spears, B. K. and Eckart, M. J. and Grim, G. P. and Hartouni, E. P. and Moore, A. S. and Schlossberg, D. J.},
abstractNote = {An important diagnostic value of a shot at the National Ignition Facility is the resultant center-of-mass motion of the imploding capsule. This residual velocity reduces the efficiency of converting laser energy into plasma temperature. A new analysis method extracts the effective hot spot motion by using information from multiple neutron time-of-flight (nToF) lines-of-sight (LoSs). This technique fits a near Gaussian spectrum to the nToF scope traces and overcomes reliance on models to relate the plasma temperature to the mean energy of the emitted neutrons. This method requires having at least four nToF LoSs. The results of this analysis will be compared to an approach where each LoS is analyzed separately and a model is employed to infer the mean energy of the emitted neutrons},
doi = {10.1063/1.5039372},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 8 works
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Figures / Tables:

FIG. 1 FIG. 1: Location of the four nToF detectors relative to the NIF target chamber.

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Works referenced in this record:

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    Works referencing / citing this record:

    Velocity correction for neutron activation diagnostics at the NIF
    journal, October 2018

    • Rinderknecht, Hans G.; Bionta, R.; Grim, G.
    • Review of Scientific Instruments, Vol. 89, Issue 10
    • DOI: 10.1063/1.5038734

    A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited)
    journal, October 2018

    • Moore, A. S.; Schlossberg, D. J.; Hartouni, E. P.
    • Review of Scientific Instruments, Vol. 89, Issue 10
    • DOI: 10.1063/1.5039322

    Neutron backscatter edge: A measure of the hydrodynamic properties of the dense DT fuel at stagnation in ICF experiments
    journal, January 2020

    • Crilly, A. J.; Appelbe, B. D.; Mannion, O. M.
    • Physics of Plasmas, Vol. 27, Issue 1
    • DOI: 10.1063/1.5128830

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