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Operation performance and ion beam characteristics related to multiply charged ions in 200 W class Hall thruster plasmas are studied. Our previous studies reported the propellant efficiency larger than unity1,2 in the cylindrical Hall thruster (CHT) plasma, which may be related to the presence of multiply charged ions. In this presentation, we report the measured result of the fraction of Xe2+ and...
Along with the low temperature plasmas operated at low pressure, the information on electrons is particularly valuable and indispensable in elucidating unrevealed discharge mechanisms and various physical phenomena occurring in atmospheric pressure plasmas. Due to the limited availability of simple electron diagnostics for atmospheric pressure plasmas, discharge properties were studied using theoretical...
We generated an atmospheric pressure helium plasma inside a silica hollow optical fiber (HOF) and the surface wettability of the inside wall was flexibly controlled by the plasma intensity. By filling the glycerol into the HOF, we experimentally investigated the surface characteristics by contact angle measurements. Liquid-fiber optic lenses with various numerical apertures were proposed and the light...
We generated atmospheric pressure helium plasma inside a hollow optical fiber (HOF). Hydrophilicity of inside wall was investigated through contact angle measurements after filling glycerol into the HOF. Controllable lensed liquid-fiber optics was fabricated under various plasma conditions.
We generated atmospheric pressure helium plasma inside and outside the flexible hollow optical fiber. We observed an optical gain at 615nm emission in the intersection of the generated plasma and an infrared laser beam at λ=1552nm and the plasma plume.
Atmospheric pressure plasma (APP) has been studied over the years as an excellent biological and medical tool for its simplicity in application and its capability to induce various bio-chemical reactions. In this presentation, we show the effect of APP on inactivation of various microorganisms (E. coli, Bacillus subtillis, Listeria monocytogenes, Salmonella Typhimurium) by showing several log reduction...
The Hall electric thruster (HET) is an electric propulsion device used for a small satellite that allows a high specific efficiency compared with chemical thrusters. A stationary plasma thruster (SPT), which is a kind of HET, is a popular device that uses a discharge mechanism to ionize and accelerate the ions. A two-dimensional particle-in-cell (PIC) simulation with Monte-Carlo collision (MCC) has...
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