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Ab initio Studies on the transport properties of high-energy density plasma

Yanhao Ding, PhD Defense, Advised by Professor John Lambropoulos

Monday, December 7, 2020
1 p.m.

High Energy Density (HED) plasmas are encountered in many fields of science ranging from planetary science and astrophysics to inertial confinement fusion (ICF). In ICF implosions, the deuterium-tritium fuel and ablator materials undergo various extreme states of matter. Accurately knowing the properties of material under such conditions is essential to both understand the implosion physics and to design the ICF targets. Quantum molecular dynamics (QMD), based on Density Functional Theory (DFT), has been successfully applied to investigate the equation of state, thermal and electrical conductivities and optical absorption of warm dense plasma. However, these QMD studies, based on Kohn-Sham DFT, cannot access to the HED plasmas with relatively high temperature and low densities. In this Ph.D. project, a time-dependent orbital-free density functional theory (TD-OF-DFT) simulation package has been developed for ab initio investigations of charged particle stopping power of warm dense matter. Our current dependent TD-OF-DFT calculations have reproduced the recently well-characterized stopping power experiment in warm dense beryllium. For α-particle stopping in warm and solid density DT plasmas, the ab initio TD-OF-DFT simulations show a lower stopping power (up to 25) % in comparison with three stopping-power models often used in the high-energy-density physics community. 

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