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Numerical study on the characteristics of nitrogen discharge at high pressure with induced plasma

Chinese Physics B 2012年第7期21卷 382-388页

作者：王一男刘悦郑殊林国强 Key Laboratory of Materials Modification by Laser Ion and Electron Beams Dalian University of Technology

Based on the fluid theory of plasma, a model is built to study the characteristics of nitrogen discharge at high pressure with induced argon plasma. In the model, species such as electrons, N2+, N4+, Ar+, and two metastable states (N 2(A3∑u+), N2 (a1 ∑u-)) are taken into account. The model includes the particle continuity equation, the electron energy balance equation, and Poisson抯equation. The model is solved with a finite difference method. The numerical results are obtained and used to investigate the effect of time taken to add nitrogen gas and initially-induced argon plasma pressure. It is found that lower speeds of adding the nitrogen gas and varying the gas pressure can induce higher plasma density, and inversely lower electron temperature. At high-pressure discharge, the electron density increases when the proportion of nitrogen component is below 40%, while the electron density will keep constant as the nitrogen component further increases. It is also shown that with the increase of initially-induced argon plasma pressure, the density of charged particles increases, and the electron temperature as well as the electric field decreases.

关键词： induced plasma nitrogen discharge numerical simulation

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Fibre-Coupling Zig-Zag Beam Deflection Technology for Investigation of Attenuation Process of Laser-induced Shock Waves

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Chinese Physics Letters 2005年第9期22卷 2426-2428页

作者：张平卞保民李振华 Department of Information Physics and Engineering Nanjing University of Science and Technology Nanjing 210094

A novel fibre-coupling zig-zag beam deflection technology is developed to investigate the attenuation process of laser-induced shock waves in air. Utilizing ordinal reflections of probe beams by a pair of parallel mirrors, a zig-zag beam field is formed, which has eleven probe beams in the horizontal plane. When a laser-induced shock wave propagates through the testing field, it causes eleven deflection signals one after another. The whole attenuation process of the shock wave in air can be detected and illuminated clearly on one experimental curve.

关键词： induced plasma NANOPARTICLE REMOVAL AIR ABLATION PROBE

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