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<專題討論>2020/10/15(四)14:10綜合大樓2樓48218教室演講 : 張博宇 助理教授(成功大學電漿所)

張貼者:2020年10月11日 下午8:40Dabby Lu
講題: Development of EUV light source and studies of high-energy-density plasma (HEDP) on a 1-kJ pulsed-power system
摘要: A pulsed-power system was built for studying various topics related to high-energy-density plasma, a regime with pressure higher than 1 MBar in general, and for generating extreme ultraviolet (EUV) light for EUV lithography. Astrophysics and space sciences can be studied experimentally using the pulsed-power system due to the magnetohydrodynamic scaling. Extreme ultraviolet light can also be generated in the HEDP regime via discharge produced plasma (DPP). The pulsed-power system we built stores 1 kJ of energy using high voltage capacitors charged to 20 kV. When it is discharged, a peak current of 110±20 kA with a rise time of 1.51±0.06 μs, i.e., a power of ~700 MW, is provided. It is the pulsed current that will be used to drive different loads for different experiments. To diagnose plasma in different experiments, a suite of ultrafast x-ray imaging systems such as time-integrated pinhole camera with an exposure time of 1 μs, a streak camera with a temporal resolution of 15 ps, and a framing camera with a potential temporal resolution of 10 ns are being built. Interferometry, collective thomson scattering for measuring plasma densities and temperatures will be implemented using a q-switch laser with the single longitudinal mode. The laser pulse will be compressed using stimulated brillouin scattering (SBS) in water so that a temporal resolution of sub-ns can be achieved. In experiments, a theta pinch will be used to compress an argon plasma plume. Temperature about 30 eV at the peak compression can be achieved so that EUV light can be radiated. On the other hand, supersonic plasma jets are generated via imploding conical-wire arrays made of tungsten wires driven by the pulsed-power system. The supersonic plasma jets will be used to simulate solar winds in the laboratory based on the hydrodynamic similarity between the solar system and the laboratory. Time-integrated images of plasma jets in visible light will be shown. This work was supported by the Ministry of Science and Technology (MOST), under Award Number 105-2112-M-006-014-MY3 and 109-2112-M-006-011.
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Dabby Lu,
2020年10月11日 下午8:40
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