Open AccessReconstructing 3D asymmetries in laser-direct-drive implosions on OMEGA
Author(s) -
O. M. Mannion,
K. M. Woo,
Aidan Crilly,
C. J. Forrest,
J. A. Frenje,
M. Gatu Johnson,
V. Yu. Glebov,
J. P. Knauer,
Z. L. Mohamed,
M. H. Romanofsky,
C. Stöeckl,
W. Theobald,
S. P. Regan
Publication year - 2021
Publication title -
review of scientific instruments
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.605
H-Index - 165
eISSN - 1089-7623
pISSN - 0034-6748
DOI - 10.1063/5.0043514
Subject(s) - inertial confinement fusion , plasma diagnostics , spectrometer , physics , laser , neutron , omega , recoil , optics , hot spot (computer programming) , detector , time of flight , nuclear physics , plasma , computational physics , materials science , computer science , quantum mechanics , operating system
Three-dimensional reconstruction algorithms have been developed, which determine the hot-spot velocity, hot-spot apparent ion temperature distribution, and fuel areal-density distribution present in laser-direct-drive inertial confinement fusion implosions on the OMEGA laser. These reconstructions rely on multiple independent measurements of the neutron energy spectrum emitted from the fusing plasma. Measurements of the neutron energy spectrum on OMEGA are made using a suite of quasi-orthogonal neutron time-of-flight detectors and a magnetic recoil spectrometer. These spectrometers are positioned strategically around the OMEGA target chamber to provide unique 3D measurements of the conditions of the fusing hot spot and compressed fuel near peak compression. The uncertainties involved in these 3D reconstructions are discussed and are used to identify a new nTOF diagnostic line of sight, which when built will reduce the uncertainty in the hot-spot apparent ion temperature distribution from 700 to <400 eV.
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