›› 2015, Vol. 24 ›› Issue (2): 25101-025101.doi: 10.1088/1674-1056/24/2/025101

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Short-pulse high-power microwave breakdown at high pressures

赵朋程a b, 廖成b, 冯菊b   

  1. a Institute of Electromagnetics, Southwest Jiaotong University, Chengdu 610031, China;
    b School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China
  • 收稿日期:2014-07-13 修回日期:2014-09-03 出版日期:2015-02-05 发布日期:2015-02-05
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 2013CB328904), the NSAF of China (Grant No. U1330109), and 2012 Doctoral Innovation Funds of Southwest Jiaotong University.

Short-pulse high-power microwave breakdown at high pressures

Zhao Peng-Cheng (赵朋程)a b, Liao Cheng (廖成)b, Feng Ju (冯菊)b   

  1. a Institute of Electromagnetics, Southwest Jiaotong University, Chengdu 610031, China;
    b School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China
  • Received:2014-07-13 Revised:2014-09-03 Online:2015-02-05 Published:2015-02-05
  • Contact: Liao Cheng E-mail:c.liao@swjtu.edu.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 2013CB328904), the NSAF of China (Grant No. U1330109), and 2012 Doctoral Innovation Funds of Southwest Jiaotong University.

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摘要： The fluid model is proposed to investigate the gas breakdown driven by a short-pulse (such as a Gaussian pulse) high-power 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.

关键词: fluid model, electron energy distribution function, gas breakdown, short-pulse high-power microwave

Abstract: The fluid model is proposed to investigate the gas breakdown driven by a short-pulse (such as a Gaussian pulse) high-power 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.

Key words: fluid model, electron energy distribution function, gas breakdown, short-pulse high-power microwave

中图分类号:  (Electrical properties)

  • 51.50.+v
52.80.Pi (High-frequency and RF discharges) 52.35.Mw (Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))