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Title: Calibration of scintillation-light filters for neutron time-of-flight spectrometers at the National Ignition Facility

Abstract

Sixty-four neutral density filters constructed of metal plates with 88 apertures of varying diameter have been radiographed with a soft x-ray source and CCD camera at National Security Technologies, Livermore. An analysis of the radiographs fits the radial dependence of the apertures’ image intensities to sigmoid functions, which can describe the rapidly decreasing intensity towards the apertures’ edges. The fitted image intensities determine the relative attenuation value of each filter. Absolute attenuation values of several imaged filters, measured in situ during calibration experiments, normalize the relative quantities which are now used in analyses of neutron spectrometer data at the National Ignition Facility.

Authors:
; ; ; ; ; ;  [1]; ;  [2]
  1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
  2. National Security Technologies, Livermore, California 94551 (United States)
Publication Date:
OSTI Identifier:
22596598
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 11; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; APERTURES; ATTENUATION; CALIBRATION; CAMERAS; CHARGE-COUPLED DEVICES; FILTERS; IGNITION; IMAGES; NEUTRON SPECTROMETERS; NEUTRONS; SCINTILLATIONS; SOFT X RADIATION; TIME-OF-FLIGHT METHOD; TIME-OF-FLIGHT SPECTROMETERS; US NATIONAL IGNITION FACILITY; X-RAY SOURCES

Citation Formats

Sayre, D. B., E-mail: sayre4@llnl.gov, Barbosa, F., Caggiano, J. A., Eckart, M. J., Grim, G. P., Hartouni, E. P., Hatarik, R., DiPuccio, V. N., and Weber, F. A. Calibration of scintillation-light filters for neutron time-of-flight spectrometers at the National Ignition Facility. United States: N. p., 2016. Web. doi:10.1063/1.4959276.
Sayre, D. B., E-mail: sayre4@llnl.gov, Barbosa, F., Caggiano, J. A., Eckart, M. J., Grim, G. P., Hartouni, E. P., Hatarik, R., DiPuccio, V. N., & Weber, F. A. Calibration of scintillation-light filters for neutron time-of-flight spectrometers at the National Ignition Facility. United States. doi:10.1063/1.4959276.
Sayre, D. B., E-mail: sayre4@llnl.gov, Barbosa, F., Caggiano, J. A., Eckart, M. J., Grim, G. P., Hartouni, E. P., Hatarik, R., DiPuccio, V. N., and Weber, F. A. Tue . "Calibration of scintillation-light filters for neutron time-of-flight spectrometers at the National Ignition Facility". United States. doi:10.1063/1.4959276.
@article{osti_22596598,
title = {Calibration of scintillation-light filters for neutron time-of-flight spectrometers at the National Ignition Facility},
author = {Sayre, D. B., E-mail: sayre4@llnl.gov and Barbosa, F. and Caggiano, J. A. and Eckart, M. J. and Grim, G. P. and Hartouni, E. P. and Hatarik, R. and DiPuccio, V. N. and Weber, F. A.},
abstractNote = {Sixty-four neutral density filters constructed of metal plates with 88 apertures of varying diameter have been radiographed with a soft x-ray source and CCD camera at National Security Technologies, Livermore. An analysis of the radiographs fits the radial dependence of the apertures’ image intensities to sigmoid functions, which can describe the rapidly decreasing intensity towards the apertures’ edges. The fitted image intensities determine the relative attenuation value of each filter. Absolute attenuation values of several imaged filters, measured in situ during calibration experiments, normalize the relative quantities which are now used in analyses of neutron spectrometer data at the National Ignition Facility.},
doi = {10.1063/1.4959276},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {Tue Nov 15 00:00:00 EST 2016},
month = {Tue Nov 15 00:00:00 EST 2016}
}