Application of the coincidence counting technique to DD neutron spectrometry data at the NIF, OMEGA, and Z

Lahmann, B.; Milanese, L. M.; Han, W.; Gatu Johnson, M.; Séguin, F. H.; Frenje, J. A.; Petrasso, R. D.; Hahn, K. D.; Jones, B.

doi:10.1063/1.4958910

Application of the coincidence counting technique to DD neutron spectrometry data at the NIF, OMEGA, and Z

Journal Article · Wed Jul 20 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4958910· OSTI ID:1285035

^[1]; ^[2]; ^[2]; Gatu Johnson, M. ^[2]; Séguin, F. H. ^[2]; ^[2]; ^[2]; Hahn, K. D. ^[3]; Jones, B. ^[3]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); HEDP DIVISION, MIT PLASMA SCIENCE AND FUSION CENTER
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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. In conclusion, these results are in excellent agreement with previous work applied to DT neutrons.

Research Organization:: HEDP Div.; Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0001857; NA0002726; NA0002949

OSTI ID:: 1285035

Alternate ID(s):: OSTI ID: 1338308
OSTI ID: 22596622

Report Number(s):: SAND--2016-6470J

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 87; ISSN 0034-6748; ISSN RSINAK

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

References (9)

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Absolute measurements of neutron yields from DD and DT implosions at the OMEGA laser facility using CR-39 track detectors Frenje, J. A.; Li, C. K.; Séguin, F. H. Review of Scientific Instruments, Vol. 73, Issue 7 https://doi.org/10.1063/1.1487889	journal	July 2002
Spectrometry of charged particles from inertial-confinement-fusion plasmas Séguin, F. H.; Frenje, J. A.; Li, C. K. Review of Scientific Instruments, Vol. 74, Issue 2 https://doi.org/10.1063/1.1518141	journal	February 2003
First measurements of the absolute neutron spectrum using the magnetic recoil spectrometer at OMEGA (invited) Frenje, J. A.; Casey, D. T.; Li, C. K. Review of Scientific Instruments, Vol. 79, Issue 10 https://doi.org/10.1063/1.2956837	journal	October 2008
Probing high areal-density cryogenic deuterium-tritium implosions using downscattered neutron spectra measured by the magnetic recoil spectrometer Frenje, J. A.; Casey, D. T.; Li, C. K. Physics of Plasmas, Vol. 17, Issue 5 https://doi.org/10.1063/1.3304475	journal	May 2010
Pulsed-power-driven cylindrical liner implosions of laser preheated fuel magnetized with an axial field Slutz, S. A.; Herrmann, M. C.; Vesey, R. A. Physics of Plasmas, Vol. 17, Issue 5 https://doi.org/10.1063/1.3333505	journal	May 2010
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Nuclear diagnostics for Inertial Confinement Fusion (ICF) plasmas Frenje, J. A. Plasma Physics and Controlled Fusion, Vol. 62, Issue 2 https://doi.org/10.1088/1361-6587/ab5137	journal	January 2020

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