Signal and background considerations for the MRSt on the National Ignition Facility (NIF)

Wink, C. W.; Frenje, J. A.; Hilsabeck, T. J.; Bionta, R.; Khater, H. Y.; Gatu Johnson, M.; Kilkenny, J. D.; Li, C. K.; Séguin, F. H.; Petrasso, R. D.

doi:10.1063/1.4958938

Signal and background considerations for the MRSt on the National Ignition Facility (NIF)

Journal Article · Wed Aug 03 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4958938· OSTI ID:1285121

Wink, C. W. ^[1]; ^[2]; Hilsabeck, T. J. ^[3]; Bionta, R. ^[4]; Khater, H. Y. ^[4]; Gatu Johnson, M. ^[2]; Kilkenny, J. D. ^[3]; Li, C. K. ^[2]; Séguin, F. H. ^[2]; ^[2]

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)
General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

A Magnetic Recoil Spectrometer (MRSt) has been conceptually designed for time-resolved measurements of the neutron spectrum at the National Ignition Facility. Using the MRSt, the goals are to measure the time-evolution of the spectrum with a time resolution of ~20-ps and absolute accuracy better than 5%. To meet these goals, a detailed understanding and optimization of the signal and background characteristics are required. Through ion-optics, MCNP simulations, and detector-response calculations, we demonstrate that the goals and a signal-to background >5-10 for the down-scattered neutron measurement are met if the background, consisting of ambient neutrons and gammas, at the MRSt is reduced 50-100 times.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center

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

Grant/Contract Number:: AC52-07NA27344; NA0001857; NA0002949

OSTI ID:: 1285121

Alternate ID(s):: OSTI ID: 22596570
OSTI ID: 1389981

Report Number(s):: LLNL-JRNL--737362

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

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Implementation of the foil-on-hohlraum technique for the magnetic recoil spectrometer for time-resolved neutron measurements at the National Ignition Facility Parker, C. E.; Frenje, J. A.; Johnson, M. Gatu Review of Scientific Instruments, Vol. 89, Issue 11 https://doi.org/10.1063/1.5052184	journal	November 2018
Response of a lead-free borosilicate-glass microchannel plate to 14-MeV neutrons and γ-rays Parker, C. E.; Frenje, J. A.; Siegmund, O. H. W. Review of Scientific Instruments, Vol. 90, Issue 10 https://doi.org/10.1063/1.5109103	journal	October 2019
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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