Interpolating individual line-of-sight neutron spectrometer measurements onto the “sky” at the National Ignition Facility (NIF)
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20ja099_full.pdf
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Author(s)
Hartouni, E.P.
Bionta, R.M.
Casey, D.T.
Eckart, M.J.
Gatu Johnson, Maria
Grim, G.P.
Hahn, K.D.
Jeet, J.
Kerr, S.M.
Kritcher, A.L.
Date Issued
December 2020
Journal
Review of Scientific Instruments
Publisher
AIP
Abstract
Nuclear diagnostics provide measurements of inertial confinement fusion (ICF) implosions used as metrics of performance for the shot. The interpretation of these measurements for shots with low mode asymmetries requires a way of combining the data to produce a “sky map” where the individual line-of-sight values are used to interpolate to other positions in the sky. These interpolations can provide information regarding the orientation of the low mode asymmetries. We describe the interpolation method, associated uncertainties, and the correlations between different metrics, e.g. Tion, down scatter ratio (DSR) and hot-spot velocity direction. This work is also related to recently reported studies [H. G. Rinderknecht et al., Phys. Rev. Lett. 124, 145002 (2020) and K. M. Woo et al., Phys. Plasmas 27, 062702 (2020)] of low mode asymmetries. We report an analysis that makes use of a newly commissioned line-of-sight, a scheme for incorporating multiple neutron spectrum measurement types, and recent work on the sources of implosion asymmetry to provide a more complete picture of implosion performance.
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/10.1063/5.0040590
