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Title: Neutron temporal diagnostic for high-yield deuterium-tritium cryogenic implosions on OMEGA

A next-generation neutron temporal diagnostic (NTD) capable of recording high-quality data for the highest anticipated yield cryogenic DT implosion experiments was recently installed at the Omega Laser Facility. A high-quality measurement of the neutron production width is required to determine the hot-spot pressure achieved in inertial confinement fusion experiments—a key metric in assessing the quality of these implosions. The design of this NTD is based on a fast-rise-time plastic scintillator, which converts the neutron kinetic energy to 350- to 450-nm-wavelength light. The light from the scintillator inside the nose-cone assembly is relayed ~16 m to a streak camera in a well-shielded location. An ~200× reduction in neutron background was observed during the first high-yield DT cryogenic implosions compared to the current NTD installation on OMEGA. An impulse response of ~40±10 ps was measured in a dedicated experiment using hard x rays from a planar target irradiated with a 10-ps short pulse from the OMEGA EP laser. Furthermore, the measured instrument response includes contributions from the scintillator rise time, optical relay, and streak camera.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Univ. of Rochester, Rochester, NY (United States)
Publication Date:
Grant/Contract Number:
NA0001944
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 5; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Rochester, Rochester, NY (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; neutrons; cameras; relays; neutron diagnostics; time measurement
OSTI Identifier:
1256424
Alternate Identifier(s):
OSTI ID: 1252338

Stoeckl, C., Boni, R., Ehrne, F., Forrest, C. J., Glebov, V. Yu., Katz, J., Lonobile, D. J., Magoon, J., Regan, S. P., Shoup, III, M. J., Sorce, A., Sorce, C., Sangster, T. C., and Weiner, D.. Neutron temporal diagnostic for high-yield deuterium-tritium cryogenic implosions on OMEGA. United States: N. p., Web. doi:10.1063/1.4948293.
Stoeckl, C., Boni, R., Ehrne, F., Forrest, C. J., Glebov, V. Yu., Katz, J., Lonobile, D. J., Magoon, J., Regan, S. P., Shoup, III, M. J., Sorce, A., Sorce, C., Sangster, T. C., & Weiner, D.. Neutron temporal diagnostic for high-yield deuterium-tritium cryogenic implosions on OMEGA. United States. doi:10.1063/1.4948293.
Stoeckl, C., Boni, R., Ehrne, F., Forrest, C. J., Glebov, V. Yu., Katz, J., Lonobile, D. J., Magoon, J., Regan, S. P., Shoup, III, M. J., Sorce, A., Sorce, C., Sangster, T. C., and Weiner, D.. 2016. "Neutron temporal diagnostic for high-yield deuterium-tritium cryogenic implosions on OMEGA". United States. doi:10.1063/1.4948293. https://www.osti.gov/servlets/purl/1256424.
@article{osti_1256424,
title = {Neutron temporal diagnostic for high-yield deuterium-tritium cryogenic implosions on OMEGA},
author = {Stoeckl, C. and Boni, R. and Ehrne, F. and Forrest, C. J. and Glebov, V. Yu. and Katz, J. and Lonobile, D. J. and Magoon, J. and Regan, S. P. and Shoup, III, M. J. and Sorce, A. and Sorce, C. and Sangster, T. C. and Weiner, D.},
abstractNote = {A next-generation neutron temporal diagnostic (NTD) capable of recording high-quality data for the highest anticipated yield cryogenic DT implosion experiments was recently installed at the Omega Laser Facility. A high-quality measurement of the neutron production width is required to determine the hot-spot pressure achieved in inertial confinement fusion experiments—a key metric in assessing the quality of these implosions. The design of this NTD is based on a fast-rise-time plastic scintillator, which converts the neutron kinetic energy to 350- to 450-nm-wavelength light. The light from the scintillator inside the nose-cone assembly is relayed ~16 m to a streak camera in a well-shielded location. An ~200× reduction in neutron background was observed during the first high-yield DT cryogenic implosions compared to the current NTD installation on OMEGA. An impulse response of ~40±10 ps was measured in a dedicated experiment using hard x rays from a planar target irradiated with a 10-ps short pulse from the OMEGA EP laser. Furthermore, the measured instrument response includes contributions from the scintillator rise time, optical relay, and streak camera.},
doi = {10.1063/1.4948293},
journal = {Review of Scientific Instruments},
number = 5,
volume = 87,
place = {United States},
year = {2016},
month = {5}
}