Analysis of core asymmetries in inertial confinement fusion implosions using three-dimensional hot-spot reconstruction

Woo, K. M.; Betti, R.; Thomas, C. A.; Stoeckl, C.; Churnetski, K.; Forrest, C. J.; Mohamed, Z. L.; Zirps, B.; Regan, S. P.; Collins, T. J. B.; Theobald, W.; Shah, R. C.; Mannion, O. M.; Patel, D.; Cao, D.; Knauer, J. P.; Glebov, V. Yu.; Goncharov, V. N.; Radha, P. B.; Rinderknecht, H. G.; Epstein, R.; Gopalaswamy, V.; Marshall, F. J.; Ivancic, S. T.; Campbell, E. M.

doi:10.1063/5.0102167

Analysis of core asymmetries in inertial confinement fusion implosions using three-dimensional hot-spot reconstruction

Journal Article · Fri Aug 26 00:00:00 EDT 2022 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0102167· OSTI ID:1885776

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Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Laboratory for Laser Energetics, University of Rochester
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Univ. of Rochester, NY (United States)

Three-dimensional effects play a crucial role during the hot-spot formation in inertial confinement fusion (ICF) implosions. A data analysis technique for 3D hot-spot reconstruction from experimental observables has been developed to characterize the effects of low modes on 3D hot-spot formations. In nuclear measurements, the effective flow direction, governed by the maximum eigenvalue in the velocity variance of apparent ion temperatures, has been found to agree with the measured hot-spot flows for implosions dominated by mode ℓ = 1. Asymmetries in areal-density (ρR) measurements were found to be characterized by a unique cosine variation along the hot-spot flow axis. In x-ray images, a 3D hot-spot x-ray emission tomography method was developed to reconstruct the 3D hot-spot plasma emissivity using a generalized spherical-harmonic Gaussian function. The gradient-descent algorithm was used to optimize the mapping between the projections from the 3D hot-spot emission model and the measured x-ray images along multiple views. Furthermore, this work establishes a platform to analyze 3D low-mode core asymmetries in ICF.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

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

Grant/Contract Number:: SC0022132; NA0003856

OSTI ID:: 1885776

Alternate ID(s):: OSTI ID: 1883649
OSTI ID: 1887393

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 29; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Analysis of core asymmetries in inertial confinement fusion implosions using three-dimensional hot-spot reconstruction

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