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Impact of imposed mode 2 laser drive asymmetry on inertial confinement fusion implosions

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Title: Impact of imposed mode 2 laser drive asymmetry on inertial confinement fusion implosions
Authors: Johnson, MG
Appelbe, BD
Chittenden, JP
Crilly, A
Delettrez, J
Forrest, C
Frenje, JA
Glebov, VY
Grimble, W
Haines, BM
Igumenshchev, IV
Janezic, R
Knauer, JP
Lahmann, B
Marshall, FJ
Michel, T
Seguin, FH
Stoeckl, C
Walsh, C
Zylstra, AB
Petrasso, RD
Item Type: Journal Article
Abstract: Low-mode asymmetries have emerged as one of the primary challenges to achieving high-performing inertial confinement fusion implosions. These asymmetries seed flows in the implosions, which will manifest as modifications to the measured ion temperature (Tion) as inferred from the broadening of primary neutron spectra. The effects are important to understand (i) to learn to control and mitigate low-mode asymmetries and (ii) to experimentally more closely capture thermal Tion used as input in implosion performance metric calculations. In this paper, results from and simulations of a set of experiments with a seeded mode 2 in the laser drive are described. The goal of this intentionally asymmetrically driven experiment was to test our capability to predict and measure the signatures of flows seeded by the low-mode asymmetry. The results from these experiments [first discussed in M. Gatu Johnson et al., Phys. Rev. E 98, 051201(R) (2018)] demonstrate the importance of interplay of flows seeded by various asymmetry seeds. In particular, measured Tion and self-emission x-ray asymmetries are expected to be well captured by interplay between flows seeded by the imposed mode 2 and the capsule stalk mount. Measurements of areal density asymmetry also indicate the importance of the stalk mount as an asymmetry seed in these implosions. The simulations brought to bear on the problem (1D LILAC, 2D xRAGE, 3D ASTER, and 3D Chimera) show how thermal Tion is expected to be significantly lower than Tion as inferred from the broadening of measured neutron spectra. They also show that the electron temperature is not expected to be the same as Tion for these implosions.
Issue Date: 1-Jan-2019
Date of Acceptance: 1-Dec-2018
URI: http://hdl.handle.net/10044/1/74351
DOI: https://dx.doi.org/10.1063/1.5066435
ISSN: 1070-664X
Publisher: AIP Publishing
Journal / Book Title: Physics of Plasmas
Volume: 26
Issue: 1
Copyright Statement: © 2019 The Author(s). Published under license by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Physics of Plasmas and may be found at https://aip.scitation.org/doi/10.1063/1.5066435
Sponsor/Funder: AWE Plc
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Lawrence Livermore National Laboratory
Funder's Grant Number: 300115146/1
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
0201 Astronomical and Space Sciences
0203 Classical Physics
Fluids & Plasmas
Publication Status: Published
Article Number: ARTN 012706
Online Publication Date: 2019-01-14
Appears in Collections:Physics
Plasma Physics
Faculty of Natural Sciences