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

Journal Article · Tue Nov 15 00:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4959276· OSTI ID:22596598

Barbosa, F.; Caggiano, J. A.; Eckart, M. J.; Grim, G. P.; Hartouni, E. P.; Hatarik, R. ^[1]; DiPuccio, V. N.; Weber, F. A. ^[2]

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1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
2. National Security Technologies, Livermore, California 94551 (United States)

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.

• OSTI ID: 22596598
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 11; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

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