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

9Citations
Citations of this article
8Readers
Mendeley users who have this article in their library.
Get full text

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. 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 A2,0 coefficient of A2,0 =-0.47 ± 0.03, directly connecting the modal contribution of the hot-spot shape with the modal contribution in laser-drive asymmetry.

Cite

CITATION STYLE

APA

Churnetski, K., Woo, K. M., Theobald, W., Radha, P. B., Betti, R., Gopalaswamy, V., … Regan, S. P. (2022). Three-dimensional hot-spot X-ray emission tomography from cryogenic deuterium-tritium direct-drive implosions on OMEGA. Review of Scientific Instruments, 93(9). https://doi.org/10.1063/5.0098977

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free