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Title:Propagation of Microplasma Packets at Star-Shaped Cavity Edges
Author(s):Fann, Chun-Hao
Contributor(s):Park, Sung-Jin
Plasma interaction
Abstract:In this investigation, the behavior of pulsed microplasma packets at the edges of star-shaped cavities is analyzed. This work is based on recent studies of standing wave behavior of pulsed microplasma between intersecting microchannels at 0.15 μs intervals. This experiment will further aid in understanding the basic fundamental nature of propagation of microplasma. The device is made of aluminum with the cavities protected by anodized nanoporous aluminum oxide (Al2O3) also known as “alumina”. A transparent indium tin oxide (ITO) boro-aluminosilicate glass is used as an electrode to discharge. A flowing system of helium (He) at 766 Torr or argon (Ar) at 765 Torr is used to observe the microplasma behavior at a frequency of 20 kHz with varying voltage of approximately 1.4 kV. An intensified charge-coupled device (ICCD) camera is used to capture the pulsed microplasma in the discharges. It can be seen from the ICCD camera that there is propagation of the microplasma. It is found that there is some confinement at the edge tips of the star. Interestingly, the starting and ending propagating behaviors of the discharge are the same for both positive and negative cycles of the AC voltage. In addition, the result also coincidentally shows that the smaller cavities generated from using the laser cutter create a localized enhanced electric field for the discharges. The propagation for helium discharge is toward the gas inlet while the propagation for argon is mainly toward the outlet. This is probably caused by the electric field distribution, thermal distribution, and the geometric properties of the cavity depending on the case of each specific gas.
Issue Date:2017-05
Date Available in IDEALS:2017-08-18

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