High-yield magnetic recoil neutron spectrometer on the National Ignition Facility for operation up to 60 MJ
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Author(s)
Gatu Johnson, Maria
Johnson, Timothy M.
Lahmann, Brandon
Séguin, Frederick H.
Sperry, B.
Bhandarkar, N.
Bionta, R.M.
Casco, E.
Casey, D.T.
Mackinnon, A.J.
Date Issued
April 2022
Journal
Review of Scientific Instruments
Publisher
AIP
Abstract
Recent progress at the National Ignition Facility (NIF), with neutron yields of order 1 × 10^17, places new constraints on diagnostics used to characterize implosion performance. The Magnetic Recoil neutron Spectrometer (MRS), which is routinely used to measure yield, ion temperature (Tion), and down-scatter ratio (dsr), has been adapted to allow measurements of dsr up to 5 × 10^17, and yield and Tion up to 2 × 10^18 in the near term with new data processing techniques and conversion foil solutions. This paper presents a solution for extending MRS operation up to a yield of 2 × 10^19 (60 MJ) by moving the spectrometer outside of the NIF shield wall. This will not only enhance the upper yield limit by 10× but also improve signal-to-background by 5×.
Description
Submitted for publication in Review of Scientific Instruments
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/5.0099317
