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Title: NIF total neutron yield diagnostic

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 50more » cm stand-off distance can be employed for the lower yields.« less

Authors:
;
Publication Date:
Sponsoring Org.:
(US)
OSTI Identifier:
40204862
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 72; Journal Issue: 1; Other Information: Othernumber: RSINAK000072000001000814000001; 632101CON; PBD: Jan 2001; Journal ID: ISSN 0034-6748
Publisher:
The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CALIBRATION; CROSS SECTIONS; NEUTRONS; SCATTERING; SIMULATION; US NATIONAL IGNITION FACILITY

Citation Formats

Cooper, Gary W, and Ruiz, Carlos L. NIF total neutron yield diagnostic. United States: N. p., 2001. Web. doi:10.1063/1.1320997.
Cooper, Gary W, & Ruiz, Carlos L. NIF total neutron yield diagnostic. United States. doi:10.1063/1.1320997.
Cooper, Gary W, and Ruiz, Carlos L. Mon . "NIF total neutron yield diagnostic". United States. doi:10.1063/1.1320997.
@article{osti_40204862,
title = {NIF total neutron yield diagnostic},
author = {Cooper, Gary W and Ruiz, Carlos L},
abstractNote = {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.},
doi = {10.1063/1.1320997},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 1,
volume = 72,
place = {United States},
year = {2001},
month = {1}
}