A compact neutron spectrometer, based on a CH foil for the production of recoil protons and CR-39 detection, is being developed for the measurements of the DD-neutron spectrum at the NIF, OMEGA, and Z facilities. As a CR-39 detector will be used in the spectrometer, the principal sources of background are neutron-induced tracks and intrinsic tracks (defects in the CR-39). To reject the background to the required level for measurements of the down-scattered and primary DD-neutron components in the spectrum, the Coincidence Counting Technique (CCT) must be applied to the data. Using a piece of CR-39 exposed to 2.5-MeV protons at the MIT HEDP accelerator facility and DD-neutrons at Z, a significant improvement of a DD-neutron signal-to-background level has been demonstrated for the first time using the CCT. These results are in excellent agreement with previous work applied to DT neutrons.
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November 2016
Research Article|
July 20 2016
Application of the coincidence counting technique to DD neutron spectrometry data at the NIF, OMEGA, and Z
B. Lahmann
;
B. Lahmann
a)
1
Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139, USA
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L. M. Milanese
;
L. M. Milanese
1
Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139, USA
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W. Han
;
W. Han
1
Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139, USA
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M. Gatu Johnson;
M. Gatu Johnson
1
Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139, USA
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F. H. Séguin;
F. H. Séguin
1
Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139, USA
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J. A. Frenje
;
J. A. Frenje
1
Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139, USA
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R. D. Petrasso
;
R. D. Petrasso
1
Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139, USA
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K. D. Hahn;
K. D. Hahn
2
Sandia National Laboratory
, Albuquerque, New Mexico 87123, USA
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B. Jones
B. Jones
2
Sandia National Laboratory
, Albuquerque, New Mexico 87123, USA
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Contributed paper, published as part of the Proceedings of the 21st Topical Conference on High-Temperature Plasma Diagnostics, Madison, Wisconsin, USA, June 2016.
Rev. Sci. Instrum. 87, 11D801 (2016)
Article history
Received:
June 06 2016
Accepted:
June 20 2016
Citation
B. Lahmann, L. M. Milanese, W. Han, M. Gatu Johnson, F. H. Séguin, J. A. Frenje, R. D. Petrasso, K. D. Hahn, B. Jones; Application of the coincidence counting technique to DD neutron spectrometry data at the NIF, OMEGA, and Z. Rev. Sci. Instrum. 1 November 2016; 87 (11): 11D801. https://doi.org/10.1063/1.4958910
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