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

Journal Article · Tue Nov 15 04:00:00 EST 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4958938· OSTI ID:22596570

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

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1. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
2. General Atomics, San Diego, California 92186 (United States)
3. Lawrence Livermore National Laboratory, Livermore, California 94550 (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, it is demonstrated 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.

• OSTI ID: 22596570
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 11 Vol. 87; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACCURACY
DESIGN
IGNITION
IONS
NEUTRON SPECTRA
NEUTRONS
OPTICS
OPTIMIZATION
RECOILS
SIGNALS
SIMULATION
SPECTROMETERS
TIME RESOLUTION