Multiple-view spectrally resolved x-ray imaging observations of polar-direct-drive implosions on OMEGA

TL;DR

This paper presents the first spectrally resolved x-ray imaging data of polar-direct-drive implosions on OMEGA, revealing 3D asymmetries and hydrodynamic features during the deceleration phase.

Contribution

It provides the first spectrally resolved x-ray images of PDD implosions, including 3D asymmetry observations linked to laser illumination patterns.

Findings

Images show zero-order hydrodynamics features.

Polar images reveal pentagonal patterns related to laser drive.

Synthetic images from simulations agree with experimental data.

Abstract

We present spatially, temporally, and spectrally resolved narrow- and broad-band x-ray images of polar-direct-drive (PDD) implosions on OMEGA. These self-emission images were obtained during the deceleration phase and bang time using several multiple monochromatic x-ray imaging instruments fielded along two or three quasi-orthogonal lines-of-sight including equatorial and polar views. The instruments recorded images based on K-shell lines from a titanium tracer located in the shell as well as continuum emission. These observations constitute the first such data obtained for PDD implosions. The image data show features attributed to zero-order hydrodynamics. Equatorial view synthetic images obtained from post-processing a 2D hydrodynamic simulation are consistent with the experimental observation. Polar view images show a pentagonal pattern that correlates with the PDD laser illumination used on OMEGA, thus revealing a 3D aspect of these experiments not previously observed.