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Title: A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited)

Abstract

A fused silica Cherenkov radiator has been utilized at the National Ignition Facility to provide a new high precision measurement of the time-of-flight spectrum of 14.1 MeV DT fusion neutrons. This detector allows a high precision (<30 ps) co-registered measurement of both a thresholded γ-ray and a neutron spectrum on a single record. Other approaches typically require γ and neutron signals to be co-registered via other diagnostics and/or dedicated timing experiments. Analysis of the co-registered γ and neutron signals allows precise extraction of the mean neutron energy and bulk hot-spot velocity, both of which were not possible with prior scintillator technologies. Initial measurements demonstrate the feasibility of this measurement and indicate that combined detection of neutrons and γ-rays on multiple lines-of-sight should enable the bulk vector velocity of the implosion hot-spot to be determined to ≈5 km/s and reduced uncertainty in the spectral width ≈0.1 keV.

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2]
+ Show Author Affiliations
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Atomic Weapons Establishment (AWE), Berkshire (United Kingdom)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); UK Ministry of Defence
OSTI Identifier:
1545509
Alternate Identifier(s):
OSTI ID: 1476838
Grant/Contract Number:  
AC52-07 nA273444
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Conference: 22. Proceedings of the 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:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Moore, Alastair S., Schlossberg, D. J., Hartouni, E. P., Sayre, D., Eckart, M. J., Hatarik, R., Barbosa, F., Root, J., Waltz, C., Beeman, B., Rubery, M. S., and Grim, G. P. A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited). United States: N. p., 2018. Web. doi:10.1063/1.5039322.
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Moore, Alastair S., Schlossberg, D. J., Hartouni, E. P., Sayre, D., Eckart, M. J., Hatarik, R., Barbosa, F., Root, J., Waltz, C., Beeman, B., Rubery, M. S., & Grim, G. P. A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited). United States. https://doi.org/10.1063/1.5039322
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Moore, Alastair S., Schlossberg, D. J., Hartouni, E. P., Sayre, D., Eckart, M. J., Hatarik, R., Barbosa, F., Root, J., Waltz, C., Beeman, B., Rubery, M. S., and Grim, G. P. Tue . "A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited)". United States. https://doi.org/10.1063/1.5039322. https://www.osti.gov/servlets/purl/1545509.
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@article{osti_1545509,
title = {A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited)},
author = {Moore, Alastair S. and Schlossberg, D. J. and Hartouni, E. P. and Sayre, D. and Eckart, M. J. and Hatarik, R. and Barbosa, F. and Root, J. and Waltz, C. and Beeman, B. and Rubery, M. S. and Grim, G. P.},
abstractNote = {A fused silica Cherenkov radiator has been utilized at the National Ignition Facility to provide a new high precision measurement of the time-of-flight spectrum of 14.1 MeV DT fusion neutrons. This detector allows a high precision (<30 ps) co-registered measurement of both a thresholded γ-ray and a neutron spectrum on a single record. Other approaches typically require γ and neutron signals to be co-registered via other diagnostics and/or dedicated timing experiments. Analysis of the co-registered γ and neutron signals allows precise extraction of the mean neutron energy and bulk hot-spot velocity, both of which were not possible with prior scintillator technologies. Initial measurements demonstrate the feasibility of this measurement and indicate that combined detection of neutrons and γ-rays on multiple lines-of-sight should enable the bulk vector velocity of the implosion hot-spot to be determined to ≈5 km/s and reduced uncertainty in the spectral width ≈0.1 keV.},
doi = {10.1063/1.5039322},
url = {https://www.osti.gov/biblio/1545509}, journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {10}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5039322
Copyright Statement
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Figures / Tables:

FIG. 1 FIG. 1: DT fit to measured time-of-flight neutron spectra resulting from different NIF implosions, highlighting the range of mean neutron energies, spectral widths, and down-scattered neutrons. N180128-002 (blue) results from a cryogenic DT-layered high-density carbon (HDC) capsule implosion. N180129-002 (red) is the broader spectrum produced by the directly driven implosionmore » of a DT gas-filled glass-shell exploding pusher, and N171120001 (black) shows the shifted mean neutron energy spectrum created by an asymmetrically driven DT gas-filled capsule. The spectra have been peak normalized.« less
All figures and tables (13 total)
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Works referenced in this record:

Impact of temperature-velocity distribution on fusion neutron peak shape
journal, May 2017

Optical properties of the DIRC fused silica Cherenkov radiator
journal, December 2003

  • Cohen-Tanugi, J.; Convery, M.; Ratcliff, B.
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First measurements of remaining shell areal density on the OMEGA laser using the Diagnostic for Areal Density (DAD)
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Using multiple neutron time of flight detectors to determine the hot spot velocity
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Recent developments in Geant4
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Review of the National Ignition Campaign 2009-2012
journal, February 2014

Characterization of photodetector temporal response for neutron time-of-flight (nToF) diagnostics at the National Ignition Facility
journal, October 2018

Capsule modeling of high foot implosion experiments on the National Ignition Facility
journal, March 2017

Mode 1 drive asymmetry in inertial confinement fusion implosions on the National Ignition Facility
journal, April 2014

Analysis of the neutron time-of-flight spectra from inertial confinement fusion experiments
journal, November 2015

Relativistic calculation of fusion product spectra for thermonuclear plasmas
journal, November 1998

Interspecimen Comparison of the Refractive Index of Fused Silica*,†
journal, January 1965

Nuclear Data Sheets for A = 28
journal, October 2013

Testing a Cherenkov neutron time-of-flight detector on OMEGA
journal, October 2018

Diagnosing inertial confinement fusion gamma ray physics (invited)
journal, October 2010

High-energy (>70 keV) x-ray conversion efficiency measurement on the ARC laser at the National Ignition Facility
journal, March 2017

Measuring x-ray burn history with the Streaked Polar Instrumentation for Diagnosing Energetic Radiation (SPIDER) at the National Ignition Facility (NIF)
conference, October 2012

Ab initio response functions for Cherenkov-based neutron detectors
journal, October 2018

ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data
journal, December 2011

Effect of the mounting membrane on shape in inertial confinement fusion implosions
journal, February 2015

Fusion neutron energies and spectra
journal, July 1973

Cherenkov radiation spectrum
journal, January 1992

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    Works referencing / citing this record:

    Testing a Cherenkov neutron time-of-flight detector on OMEGA
    journal, October 2018

    Using multiple neutron time of flight detectors to determine the hot spot velocity
    journal, October 2018

    Characterization of photodetector temporal response for neutron time-of-flight (nToF) diagnostics at the National Ignition Facility
    journal, October 2018

    Ab initio response functions for Cherenkov-based neutron detectors
    journal, October 2018

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

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      Figures / Tables found in this record:

      FIG. 1(p. 3)figure
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      FIG. 8(p. 7)figure
      FIG. 10(p. 8)figure
      FIG. 11(p. 8)figure
      FIG. 9(p. 8)figure
      TABLE I(p. 9)table
      FIG. 12(p. 10)figure
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        Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

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