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【期刊论文】A three-frame Mach-Zehnder interferometer for measuring dense magnetized plasmas
王新新, Xinxin Wang, a), Xiaobing Zou, Zhen Liu, Min Han, Chengmu Luo, and Ruili Ma
Rev. Sci. Instrum., Vol. 74, No.3, March 2003,-0001,():
-1年11月30日
A three-frame Mach-Zehnder interferometer TFMZI was developed for taking three pictures of the imploding plasma produced by one shot of fast pulsed discharge. TFMZI consists of a YAG laser, a beam splitter, and a Mach-Zehnder interferometer. By passing through the beam splitter the laser beam was split into three beams with an interbeam delay of 13ns and each laser beam will give a snapshot of the implosion state. The measurements with the TFMZI were conducted on a small gas-puff z-pinch device and gave good results. In principle an upgraded four or more frame Mach-Zehnder interferometer could be constructed if much improvement was made on the TFMZI.
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【期刊论文】Study on an atmospheric pressure glow discharge
王新新, Xinxin Wang, Chengrong Li, Mingze Lu and Yikang Pu
Plasma Sources Sci. Technol. 12(2003)358-361,-0001,():
-1年11月30日
Experiments were performed on an atmospheric pressure glow discharge (APGD) in an air gap between two dielectric barrier electrodes. While it is possible to get an APGD in a 2mm air gap, it is possible to get only a filament discharge in a 5mm air gap. The development of an electron avalanche in such a gap was numerically simulated. It was found that the critical applied field for a 5mm electron avalanche to transit to a streamer is equal to 35.07kVcm−1. This calculated critical applied field is in good agreement with the experimental one. The experimental and theoretical results confirm that only a filament discharge, rather than a glow discharge, can be produced in an atmospheric pressure air gap that is not less than 5mm if it is not possible to lower the breakdown field of air. A resistive barrier discharge (RBD) was theoretically analysed and the development of RBD was numerically simulated. If a kilohertz discharge is required, the parameters of the resistive layer should be in the range ρεr=(109-1011)cm. APGD in a helium gap was realized using 50Hz line power with a suitably fabricated resistive layer.
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【期刊论文】Experimental study of gas-puff z-pinch plasma
王新新, Xiaobing Zou, Xinxin Wang, Chengmu Luo and Min Han
Plasma Sources Sci. Technol. 14(2005)268-272,-0001,():
-1年11月30日
A small neon gas-puff z-pinch device was constructed, and the plasma implosion and its radiation characteristics were studied experimentally. The plasma implosion was investigated using a three-frame Mach-Zehnder interferometer (TFMZI) that is capable of taking three pictures (5ns exposure and 13ns interpicture delay) within a single z-pinch shot. Thermopiles were also used in the experiments with the TFMZI to study the correlation between the total energy of x-ray emission and the plasma implosion. The ion beams from the z-pinch plasma were analysed using a compact Thomson spectrometer. Based on the experiments, the imploding velocity and electron density of the plasma shell were obtained, a conclusion that a nearly uniform and symmetric imploding plasma shell would emit a higher x-ray yield than an asymmetric one was drawn and the charge state resolved energy spectra of ion beams emitted from the z-pinch plasma were plotted.
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【期刊论文】The gas discharge in a gas peaking switch
王新新, XINXIN WANG, YUAN HU, and XINHAI SONG
Laser and Particle Beams (2005), 23, 1-6. Printed in the USA.,-0001,():
-1年11月30日
The gas discharge in a gas peaking switch was experimentally studied and numerically simulated. For simulation, the discharge was divided into two phases, gas breakdown and voltage collapse. The criterion for an electron avalanche to transit to streamer was considered as the criterion of gas breakdown. The spark channel theory developed by Rompe-Weizel was used to calculate the spark resistance. It was found that the prepulse considerably lowers the voltage pulse applied to the gap. Even for a given input pulse, the voltage pulse applied to a peaking gap is different for different gap distance due to existence of a different prepulse. In this case, the breakdown voltage of a gas peaking gap depends on gas pressure and gap distance, individually. For nitrogen pressure varying from 3 MPa to 10 MPa and gap distance from 0.6mm to 1.2mm, the peak electric field higher than 2MV0cm was achieved when breakdown. The output 10% to 90% rise time, tr, varies from 145ps to 192ps. As gas pressure increases, trdecreases, which can be explained by the fact that the breakdown field increases with the increase of gas pressure. It was found in experiment that the jitter in tr could be attributed to the jitter in breakdown field. Instead of getting longer, the averaged experimental tr gets shorter as gap distance increases from 0.6mm to 1.2mm, which differs from the results of calculation and indicates there may exist something, other than electric field, that is also related to tr. The reason for this difference may lies in the inverse coefficient of spark resistance varying with gap distance. On the whole, the results from the calculations agree with the experimental ones.
Electron avalanche, Gas breakdown, Peaking switch, Spark resistance, Streamer
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