Short-pulse high-power microwave breakdown at high pressures

The fluid model is proposed to investigate the gas breakdown driven by a short-pulse（such as a Gaussian pulse） highpower microwave at high pressures.However,the fluid model requires specification of the electron energy distribution function（EEDF）;the common assumption of a Maxwellian EEDF can result...

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Bibliographic Details
Published inChinese physics B Vol. 24; no. 2; pp. 282 - 286
Main Author 赵朋程 廖成 冯菊
Format Journal Article
LanguageEnglish
Published 01.02.2015
Subjects
Breakdown
Computational fluid dynamics
Computer simulation
Fluid flow
Fluids
Gas breakdown
Mathematical models
Microwaves
Pulse shape
气体击穿
波尔兹曼方程
流体模型
电子能量分布函数
矩形脉冲
短脉冲
高功率微波
高压力
Online AccessGet full text
ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/24/2/025101

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Summary:The fluid model is proposed to investigate the gas breakdown driven by a short-pulse（such as a Gaussian pulse） highpower microwave at high pressures.However,the fluid model requires specification of the electron energy distribution function（EEDF）;the common assumption of a Maxwellian EEDF can result in the inaccurate breakdown prediction when the electrons are not in equilibrium.We confirm that the influence of the incident pulse shape on the EEDF is tiny at high pressures by using the particle-in-cell Monte Carlo collision（PIC-MCC） model.As a result,the EEDF for a rectangular microwave pulse directly derived from the Boltzmann equation solver Bolsig＋ is introduced into the fluid model for predicting the breakdown threshold of the non-rectangular pulse over a wide range of pressures,and the obtained results are very well matched with those of the PIC-MCC simulations.The time evolution of a non-rectangular pulse breakdown in gas,obtained by the fluid model with the EEDF from Bolsig＋,is presented and analyzed at different pressures.In addition,the effect of the incident pulse shape on the gas breakdown is discussed.
Bibliography:Zhao Peng-Cheng, Liao Cheng, and Feng Ju（ a） Institute of Electromagnetics, Southwest Jiaotong University, Chengdu 610031, China; b） School of Physics and Optoelectronic Engineering, Xidian University, Xi＇an 710071, China
fluid model, electron energy distribution function, gas breakdown, short-pulse high-power microwave
11-5639/O4
The fluid model is proposed to investigate the gas breakdown driven by a short-pulse（such as a Gaussian pulse） highpower microwave at high pressures.However,the fluid model requires specification of the electron energy distribution function（EEDF）;the common assumption of a Maxwellian EEDF can result in the inaccurate breakdown prediction when the electrons are not in equilibrium.We confirm that the influence of the incident pulse shape on the EEDF is tiny at high pressures by using the particle-in-cell Monte Carlo collision（PIC-MCC） model.As a result,the EEDF for a rectangular microwave pulse directly derived from the Boltzmann equation solver Bolsig＋ is introduced into the fluid model for predicting the breakdown threshold of the non-rectangular pulse over a wide range of pressures,and the obtained results are very well matched with those of the PIC-MCC simulations.The time evolution of a non-rectangular pulse breakdown in gas,obtained by the fluid model with the EEDF from Bolsig＋,is presented and analyzed at different pressures.In addition,the effect of the incident pulse shape on the gas breakdown is discussed.
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ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/24/2/025101