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

Abstract

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 inmore » laser-drive asymmetry.« less

Authors:

Churnetski, K.  ^[1];

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• Search DOE PAGES for ORCID "0000-0003-3337-2647"

Woo, K. M.  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-1124-3871"

Theobald, W.  ^[1];

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

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Igumenshchev, I. V.  ^[1];

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Ivancic, S. T.  ^[1];

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• Search DOE PAGES for ORCID "0000-0001-9472-4226"

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

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• Search DOE PAGES for ORCID "0000-0001-5375-5800"

Thomas, C. A. ^[1]; Regan, S. P.  ^[1]

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• Search DOE PAGES for ORCID "0000-0001-6359-7172"

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+ Show Author Affiliations

1. Univ. of Rochester, NY (United States)

Publication Date:

Fri Sep 30 00:00:00 EDT 2022

Research Org.:

Univ. of Rochester, NY (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1897069

Alternate Identifier(s):

OSTI ID: 1890556

Grant/Contract Number:  

NA0003856

Resource Type:

Accepted Manuscript

Journal Name:

Review of Scientific Instruments

Additional Journal Information:

Journal Volume: 93; Journal Issue: 9; Conference: 24. High-Temperature Plasma Diagnostic Conference, Rochester, NY (United States), 15-19 May 2022; Journal ID: ISSN 0034-6748

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

70 PLASMA PHYSICS AND FUSION TECHNOLOGY; X-ray diagnostics; Tritium; Hydrodynamics simulations; Plasma confinement; Fusion experiments; Deuterium; X-ray imaging; Tomography