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discharge channel GROWTH IN MICRO EDM OF HIGH FREQUENCY PULSE

Transactions of Nanjing University of Aeronautics and Astronautics 2011年第4期28卷 353-361页

作者：刘宇王津王元刚赵福令大连交通大学机械工程学院大连理工大学精密与特种加工教育部重点实验室大连大学机械工程学院

The influences of intense magnetic pinch effect caused by electromagnetic field with high frequency on discharge channel expansion and plasma configuration change are discussed. The change of Lorentz force exerting on charged particles in discharge channel is calculated under the electromagnetic field with high frequency. Through the theoretical analysis and experimental study, the forming process of discharge channel is conjectured. And it is considered that the changes of discharge channel, such as the decrease of diameter and increase of energy density, coming from the intense magnetic pinch effect in high frequency electromagnetic field, are the main reasons for a series of special phenomena on the machined surface in micro EDM.

关键词： micro EDM discharge channel high frequency electromagnetic field magnetic pinch effect discharge crater

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Plasma Characteristic of Lightning discharge channel

Plasma Characteristic of Lightning Discharge Channel

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第八届全国优秀青年气象科技工作者学术研讨会

作者： ZHANG Huaming YUAN Ping ZHANG Yijun WAN Jianjie OUYANG Yuhua WANG Dongfang Thunder Prevention and Observation Center of Shanxi Province College of Physics and Electronic Engineering Northwest Normal University Laboratory of Lightning Physics and Protection Engineering Chinese Academy of Meteorological Sciences School of Mathematics and Physics Lanzhou Jiaotong University Laboratory for Middle Atmosphere and Global Environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences

The plasma characteristics of a lightning discharge channel are *** spectrum of the natural lightning is investigated by employing the slit-less *** is found that the spectrum characteristics are closely related to the intensity of the lightning *** lines in the lightning spectrum are classified into essential lines and characteristic lines,according to the characteristics of lightning spectra with different *** characteristics of the lightning channel and the radiation of the lighting plasma are analyzed in the visible and infrared *** is shown that,the visible spectrum of lightning is determined by the radiation generated from the early stage to the development of lightning,while the near-infrared spectrum is determined by the radiation generated after current of lightning reaches the *** channel temperature and the electron density are calculated using the information obtained from the lightning *** the temperature and the density decrease with the increasing length of lightning ***,X-rays and neutrons are produced in the process of lighting mainly due to the pinch effects.

关键词： lightning discharge plasma lightning spectra discharge channel return stroke channel temperature electron density

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A novel method for multichannel discharge image diagnosis in gas switches based on multi-axis tomography techniques

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Plasma Science and Technology 2023年第6期25卷 65-71页

作者：张艳红盛亮李阳张美黑东炜 State Key Laboratory of Intense Pulsed Radiation Simulation and Effect Northwest Institute of Nuclear TechnologyXi'an 710024People's Republic of China

The discharge channel is a crucial diagnostic tool for identifying the properties of gas ***,single-view images cannot easily be used to inherently understand the discharge channel characteristics of trigger electrodes.A reconstruction method of the discharge channel in gas switches is proposed based on a multi-axis tomography technique,which uses very few projections of optical images to reconstruct the location of a multichannel discharge in annular *** this paper,an algorithm named TVM-OSEM(total variation minimization ordered subsets expectation maximization)is proposed,which can effectively remove artifact noise to improve the reconstruction accuracy of discharge *** method is validated against simulations of a radiator with high-density-difference *** calculated discharge channel distribution from one experiment is presented.

关键词： discharge channel TVM-OSEM gas switch location

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