Probing atomic physics at ultrahigh pressure using laser-driven implosions

S. X. Hu (), David T. Bishel, David A. Chin, Philip M. Nilson (), Valentin V. Karasiev, Igor E. Golovkin, Ming Gu, Stephanie B. Hansen, Deyan I. Mihaylov, Nathaniel R. Shaffer, Shuai Zhang and Timothy Walton
Additional contact information
S. X. Hu: University of Rochester
David T. Bishel: University of Rochester
David A. Chin: University of Rochester
Philip M. Nilson: University of Rochester
Valentin V. Karasiev: University of Rochester
Igor E. Golovkin: Prism Computational Sciences
Ming Gu: Prism Computational Sciences
Stephanie B. Hansen: Sandia National Laboratories
Deyan I. Mihaylov: University of Rochester
Nathaniel R. Shaffer: University of Rochester
Shuai Zhang: University of Rochester
Timothy Walton: Prism Computational Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-11

Abstract: Abstract Spectroscopic measurements of dense plasmas at billions of atmospheres provide tests to our fundamental understanding of how matter behaves at extreme conditions. Developing reliable atomic physics models at these conditions, benchmarked by experimental data, is crucial to an improved understanding of radiation transport in both stars and inertial fusion targets. However, detailed spectroscopic measurements at these conditions are rare, and traditional collisional-radiative equilibrium models, based on isolated-atom calculations and ad hoc continuum lowering models, have proved questionable at and beyond solid density. Here we report time-integrated and time-resolved x-ray spectroscopy measurements at several billion atmospheres using laser-driven implosions of Cu-doped targets. We use the imploding shell and its hot core at stagnation to probe the spectral changes of Cu-doped witness layer. These measurements indicate the necessity and viability of modeling dense plasmas with self-consistent methods like density-functional theory, which impact the accuracy of radiation transport simulations used to describe stellar evolution and the design of inertial fusion targets.

Date: 2022
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DOI: 10.1038/s41467-022-34618-6

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