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Title: Characterization of photodetector temporal response for neutron time-of-flight (nToF) diagnostics at the National Ignition Facility

Abstract

The temporal response of a microchannel plate photomultiplier tube used in the suite of neutron time of flight (nToF) diagnostics at the National Ignition Facility has been characterized to reduce uncertainty in, and understanding of, shot parameters obtained from nTOF data. A short singular pulse laser, neutral density glass filters, and electrical attenuators were used to gather statistically significant samples of photodetector impulse response functions (IRF) in rapid succession. Individual components have been absolutely calibrated to minimize systematic uncertainties. The zeroth (collected charge), first (transit time), and second central moments (transit time spread) of the IRF were calculated as either the bias voltage or the amount of light incident on the detector was varied. Timing reference was provided by a monitor photodiode viewing a pickoff of the incident laser pulse. The primary sources of uncertainty are jitter in the monitor photodiode and the statistical variation across our measurement period. The spreads in the first moment, with respect to the timing photodiode, and the square root of the second central moment were found to be less than 50 ps and 150 ps, respectively.

Authors:
 [1]; ORCiD logo [2];  [2];  [2];  [2];  [2]; ORCiD logo [2];  [2];  [2]
  1. Univ. of California, Berkeley, CA (United States)
  2. 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:
1545518
Alternate Identifier(s):
OSTI ID: 1477527
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Gordon, J. M., Schlossberg, D. J., Eckart, M. J., Datte, P. S., Durand, C. E., Grim, G. P., Hartouni, E. P., Hatarik, R., and Moore, A. S. Characterization of photodetector temporal response for neutron time-of-flight (nToF) diagnostics at the National Ignition Facility. United States: N. p., 2018. Web. doi:10.1063/1.5039390.
Gordon, J. M., Schlossberg, D. J., Eckart, M. J., Datte, P. S., Durand, C. E., Grim, G. P., Hartouni, E. P., Hatarik, R., & Moore, A. S. Characterization of photodetector temporal response for neutron time-of-flight (nToF) diagnostics at the National Ignition Facility. United States. doi:10.1063/1.5039390.
Gordon, J. M., Schlossberg, D. J., Eckart, M. J., Datte, P. S., Durand, C. E., Grim, G. P., Hartouni, E. P., Hatarik, R., and Moore, A. S. Mon . "Characterization of photodetector temporal response for neutron time-of-flight (nToF) diagnostics at the National Ignition Facility". United States. doi:10.1063/1.5039390. https://www.osti.gov/servlets/purl/1545518.
@article{osti_1545518,
title = {Characterization of photodetector temporal response for neutron time-of-flight (nToF) diagnostics at the National Ignition Facility},
author = {Gordon, J. M. and Schlossberg, D. J. and Eckart, M. J. and Datte, P. S. and Durand, C. E. and Grim, G. P. and Hartouni, E. P. and Hatarik, R. and Moore, A. S.},
abstractNote = {The temporal response of a microchannel plate photomultiplier tube used in the suite of neutron time of flight (nToF) diagnostics at the National Ignition Facility has been characterized to reduce uncertainty in, and understanding of, shot parameters obtained from nTOF data. A short singular pulse laser, neutral density glass filters, and electrical attenuators were used to gather statistically significant samples of photodetector impulse response functions (IRF) in rapid succession. Individual components have been absolutely calibrated to minimize systematic uncertainties. The zeroth (collected charge), first (transit time), and second central moments (transit time spread) of the IRF were calculated as either the bias voltage or the amount of light incident on the detector was varied. Timing reference was provided by a monitor photodiode viewing a pickoff of the incident laser pulse. The primary sources of uncertainty are jitter in the monitor photodiode and the statistical variation across our measurement period. The spreads in the first moment, with respect to the timing photodiode, and the square root of the second central moment were found to be less than 50 ps and 150 ps, respectively.},
doi = {10.1063/1.5039390},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {10}
}

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