Reconstructing 3-D Asymmetries in Laser-Direct-Drive Implosions on OMEGA
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20ja103_full.pdf
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Author(s)
Mannion, O.M.
Woo, K.M.
Crilly, A.J.
Forrest, C.J.
Frenje, Johan A.
Glebov, V.Yu.
Gatu Johnson, Maria
Knauer, J. P.
Mohamed, Z.L.
Romanofsky, M.H.
Date Issued
December 2020
Journal
Review of Scientific Instruments
Publisher
AIP
Abstract
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 3-D measurements of the conditions of the fusing hot spot and compressed fuel near peak compression. The uncertainties involved in these 3-D 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.
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/10.1063/5.0043514
