Measurements of electron avalanche formation time in W-band microwave air breakdown

被引：22

作者：

Cook, Alan M. ^{[1
]}

Hummelt, Jason S. ^{[1
]}

Shapiro, Michael A. ^{[1
]}

Temkin, Richard J. ^{[1
]}

机构：

[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

来源：

PHYSICS OF PLASMAS | 2011年 / 18卷 / 08期

关键词：

air; electron avalanches; high-frequency discharges; plasma diagnostics; plasma pressure;

D O I：

10.1063/1.3626383

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We present measurements of formation times of electron avalanche ionization discharges induced by a focused 110 GHz millimeter-wave beam in atmospheric air. Discharges take place in a free volume of gas, with no nearby surfaces or objects. When the incident field amplitude is near the breakdown threshold for pulsed conditions, measured formation times are similar to 0.1-2 mu s over the pressure range 5-700 Torr. Combined with electric field breakdown threshold measurements, the formation time data shows the agreement of 110 GHz air breakdown with the similarity laws of gas discharges. (C) 2011 American Institute of Physics. [doi:10.1063/1.3626383]

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