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Author Cooper, Gary. W. ♦ Ruiz, Carlos L.
Sponsorship (US)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Publisher The American Physical Society
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ♦ CALIBRATION ♦ CROSS SECTIONS ♦ NEUTRONS ♦ SCATTERING ♦ SIMULATION ♦ US NATIONAL IGNITION FACILITY
Abstract We have designed a total neutron yield diagnostic for the National Ignition Facility (NIF) which is based on the activation of In and Cu samples. The particular approach that we have chosen is one in which we calibrate the entire counting system and which we call the ''F factor'' method. In this method, In and/or Cu samples are exposed to known sources of DD and DT neutrons. The activated samples are then counted with an appropriate system: a high purity Ge detector for In and a NaI coincidence system for Cu. We can then calculate a calibration factor, which relates measured activity to total neutron yield. The advantage of this approach is that specific knowledge of such quantities as cross sections and detector efficiencies is not needed. Unless the actual scattering environment of the NIF can be mocked up in the calibration experiment, the F factor will have to be modified using the results of a numerical simulation of the NIF scattering environment. In this article, the calibration factor methodology will be discussed and experimental results for the calibration factors will be presented. Total NIF neutron yields of 10{sup 9}--10{sup 19} can be measured with this method assuming a 50 cm stand-off distance can be employed for the lower yields.
ISSN 00346748
Educational Use Research
Learning Resource Type Article
Publisher Date 2001-01-01
Publisher Place United States
Journal Review of Scientific Instruments
Volume Number 72
Issue Number 1


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