Three-dimensional hot-spot x-ray emission tomography from cryogenic deuterium–tritium direct-drive implosions on OMEGA

Churnetski, K.; Woo, K. M.; Theobald, W.; Radha, P. B.; Betti, R.; Gopalaswamy, V.; Igumenshchev, I. V.; Ivancic, S. T.; Michalko, M.; Shah, R. C.; Stoeckl, C.; Thomas, C. A.; Regan, S. P.

doi:10.1063/5.0098977

Title: Three-dimensional hot-spot x-ray emission tomography from cryogenic deuterium–tritium direct-drive implosions on OMEGA

Journal Article · Fri Sep 30 00:00:00 EDT 2022 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0098977· OSTI ID:1897069

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^[1]; Radha, P. B. ^[1]; Betti, R. ^[1];

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^[1]; Michalko, M. ^[1]; Shah, R. C. ^[1];

^[1]; Thomas, C. A. ^[1];

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Univ. of Rochester, NY (United States)

A three-dimensional model of the hot-spot x-ray emission has been developed and applied to the study of low-mode drive asymmetries in direct-drive inertial confinement fusion implosions on OMEGA with cryogenic deuterium–tritium targets. Here, the steady-state model assumes an optically thin plasma and the data from four x-ray diagnostics along quasi-orthogonal lines of sight are used to obtain a tomographic reconstruction of the hot spot. A quantitative analysis of the hot-spot shape is achieved by projecting the x-ray emission into the diagnostic planes and comparing this projection to the measurements. The model was validated with radiation-hydrodynamic simulations assuming a mode-2 laser illumination perturbation resulting in an elliptically shaped hot spot, which was accurately reconstructed by the model using synthetic x-ray images. This technique was applied to experimental data from implosions in polar-direct-drive illumination geometry with a deliberate laser-drive asymmetry, and the hot-spot emission was reconstructed using spherical-harmonic modes of up to ℓ = 3. A 10% stronger drive on the equator relative to that on the poles resulted in a prolate-shaped hot spot at stagnation with a large negative A_2,0 coefficient of A_2,0 = –0.47 ± 0.03, directly connecting the modal contribution of the hot-spot shape with the modal contribution in laser-drive asymmetry.

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Research Organization:: Univ. of Rochester, NY (United States)

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

Grant/Contract Number:: NA0003856

OSTI ID:: 1897069

Alternate ID(s):: OSTI ID: 1890556

Journal Information:: Review of Scientific Instruments, Vol. 93, Issue 9; Conference: 24. High-Temperature Plasma Diagnostic Conference, Rochester, NY (United States), 15-19 May 2022; ISSN 0034-6748

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

Country of Publication:: United States

Language:: English

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Title: Three-dimensional hot-spot x-ray emission tomography from cryogenic deuterium–tritium direct-drive implosions on OMEGA

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