DOE Plasma Science Center Control of Plasma Kinetics

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DOE Plasma Science Center Control of Plasma Kinetics OBSERVATION OF KELVIN-HELMHOLTZ-LIKE INSTABILITY AT THE PLASMA-LIQUID INTERFACE Using a newly constructed 2-D bubble apparatus, Schlieren measurements of plasma induced density gradients at the interface are being studied. Previous measurements suggest that plasma induced, liquid flow speeds near the bubble interface are higher than distant points which suggests that shear forces are important at the interface. Schlieren images revealed an active boundary layer at the interface that becomes unstable over time giving rise to a Kelvin-Helmholtz-like instability. No plasma Pulsed plasma in bubble DOE Plasma Science Center Control of Plasma Kinetics HIGHLIGHT May 2016 1

PLASMA-INDUCED CRYSTALLIZATION OF SILICON NANOPARTICLES Hypothesis: Crystallization of Si nanoparticles enabled by plasma heating [1]. Developed 2D numerical model that self-consistently embeds detailed aerosol dynamics into plasma hydrodynamics simulation [2]. Conducted simulations for geometry and conditions of experiments [3]. Results from simulations are consistent with hypothesis of plasma-induced crystallization. [1]. L. Mangolini and U. Kortshagen, Phys. Rev. E 79, 026405 (2009). [2]. R. Le Picard, A. H. Markosyan, D. H. Porter, S. L. Girshick and M. J. Kushner, to be published, Plasma Chem. Plasma Process. [3]. L. Mangolini, E. Thimsen, and U. Kortshagen, Nano Lett. 5, 655 (2005). Densities of (left) Total positive ions; (right) H atoms (left) Gas temperature; (right) Internal temperature of 2-nm Si nanoparticles DOE Plasma Science Center Control of Plasma Kinetics HIGHLIGHT May 2016 2