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Interpolating individual line-of-sight neutron spectrometer measurements onto the “sky” at the National Ignition Facility (NIF)

Harvard Dataverse (Africa Rice Center, Bioversity International, CCAFS, CIAT, IFPRI, IRRI and WorldFish)

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Title Interpolating individual line-of-sight neutron spectrometer measurements onto the “sky” at the National Ignition Facility (NIF)
 
Identifier https://doi.org/10.7910/DVN/F1Q4EW
 
Creator E. P. Hartouni, R. M. Bionta, D. T. Casey, M. J. Eckart, M. Gatu-Johnson, G. P. Grim, K. D. Hahn, J. Jeet, S. M. Kerr, A. L. Kritcher, B. J. MacGowan, A. S. Moore, D. H. Munro, D. J. Schlossberg, A. Zylstra
 
Publisher Harvard Dataverse
 
Description 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.
 
Subject Physics
deuterium-tritium fusion
inertial confinement fusion
low-mode asymmetry
National Ignition Facility
neutron spectrometry