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Title: Gas breakdown driven by L band short-pulse high-power microwave

Abstract

High power microwave (HPM) driven gas breakdown is a major factor in limiting the radiation and transmission of HPM. A method that HPM driven gas breakdown could be obtained by changing the aperture of horn antenna is studied in this paper. Changing the effective aperture of horn antenna can adjust the electric field in near field zone, leading to gas breakdown. With this method, measurements of air and SF{sub 6} breakdowns are carried out on a magnetically insulated transmission-line oscillators, which is capable of generating HPM with pulse duration of 30 ns, and frequency of 1.74 GHz. The typical breakdown waveforms of air and SF{sub 6} are presented. Besides, the breakdown field strengths of the two gases are derived at different pressures. It is found that the effects of air and SF{sub 6} breakdown on the transmission of HPM are different: air breakdown mainly shortens the pulse width of HPM while SF{sub 6} breakdown mainly reduces the peak output power of HPM. The electric field threshold of SF{sub 6} is about 2.4 times larger than that of air. These differences suggest that gas properties have a great effect on the transmission characteristic of HPM in gases.

Authors:
; ;  [1]
  1. College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073 (China)
Publication Date:
OSTI Identifier:
22072601
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 19; Journal Issue: 12; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AIR; ANTENNAS; APERTURES; BREAKDOWN; ELECTRIC FIELDS; GHZ RANGE; HIGH-FREQUENCY DISCHARGES; MICROWAVE RADIATION; OSCILLATORS; POWER TRANSMISSION LINES; PULSES; SULFUR FLUORIDES; WAVE FORMS

Citation Formats

Yang Yiming, Yuan Chengwei, and Qian Baoliang. Gas breakdown driven by L band short-pulse high-power microwave. United States: N. p., 2012. Web. doi:10.1063/1.4768220.
Yang Yiming, Yuan Chengwei, & Qian Baoliang. Gas breakdown driven by L band short-pulse high-power microwave. United States. doi:10.1063/1.4768220.
Yang Yiming, Yuan Chengwei, and Qian Baoliang. Sat . "Gas breakdown driven by L band short-pulse high-power microwave". United States. doi:10.1063/1.4768220.
@article{osti_22072601,
title = {Gas breakdown driven by L band short-pulse high-power microwave},
author = {Yang Yiming and Yuan Chengwei and Qian Baoliang},
abstractNote = {High power microwave (HPM) driven gas breakdown is a major factor in limiting the radiation and transmission of HPM. A method that HPM driven gas breakdown could be obtained by changing the aperture of horn antenna is studied in this paper. Changing the effective aperture of horn antenna can adjust the electric field in near field zone, leading to gas breakdown. With this method, measurements of air and SF{sub 6} breakdowns are carried out on a magnetically insulated transmission-line oscillators, which is capable of generating HPM with pulse duration of 30 ns, and frequency of 1.74 GHz. The typical breakdown waveforms of air and SF{sub 6} are presented. Besides, the breakdown field strengths of the two gases are derived at different pressures. It is found that the effects of air and SF{sub 6} breakdown on the transmission of HPM are different: air breakdown mainly shortens the pulse width of HPM while SF{sub 6} breakdown mainly reduces the peak output power of HPM. The electric field threshold of SF{sub 6} is about 2.4 times larger than that of air. These differences suggest that gas properties have a great effect on the transmission characteristic of HPM in gases.},
doi = {10.1063/1.4768220},
journal = {Physics of Plasmas},
number = 12,
volume = 19,
place = {United States},
year = {Sat Dec 15 00:00:00 EST 2012},
month = {Sat Dec 15 00:00:00 EST 2012}
}