An investigation of electromagnetic wave propagation in plasma by shock tube

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	An investigation of electromagnetic wave propagation in plasma by shock tube
	Zhu NY(竺乃宜); Li XF(李学芬); Huang LS(黄立舜); Yu XL(余西龙); Yang QS(杨乾锁); Zhu, NY (reprint author), Chinese Acad Sci, Inst Mech, Lab High Temp Gas Dynam, Beijing 100080, Peoples R China.
发表期刊	Acta Mechanica Sinica
	2004
卷号	20 期号:3 页码:212-218
ISSN	0567-7718
摘要	This paper presents the electromagnetic wave propagation characteristics in plasma and the attenuation coefficients of the microwave in terms of the parameters n(e), v, w, L, w(b). The phi800 mm high temperature shock tube has been used to produce a uniform plasma. In order to get the attenuation of the electromagnetic wave through the plasma behind a shock wave, the microwave transmission has been used to measure the relative change of the wave power. The working frequency is f = (2 similar to 35) GHz (w = 2pif, wave length lambda = 15 cm similar to 8 mm). The electron density in the plasma is n(e) = (3 x 10(10) similar to 1 x 10(14)) cm(-3). The collision frequency v = (1 x 10(8) similar to 6 x 10(10)) Hz. The thickness of the plasma layer L = (2 similar to 80) cm. The electron circular frequency w(b) = eB(0)/m(e), magnetic flux density B-0 = (0 similar to 0.84) T. The experimental results show that when the plasma layer is thick (such as L/lambda greater than or equal to 10), the correlation between the attenuation coefficients of the electromagnetic waves and the parameters n(e), v, w, L determined from the measurements are in good agreement with the theoretical predictions of electromagnetic wave propagations in the uniform infinite plasma. When the plasma layer is thin (such as when both L and lambda are of the same order), the theoretical results are only in a qualitative agreement with the experimental observations in the present parameter range, but the formula of the electromagnetic wave propagation theory in an uniform infinite plasma can not be used for quantitative computations of the correlation between the attenuation coefficients and the parameters n(e), v, w, L. In fact, if w < w(p), v(2) much less than w(2), the power attenuations K of the electromagnetic waves obtained from the measurements in the thin-layer plasma are much smaller than those of the theoretical predictions. On the other hand, if w > w(p), v(2) much less than w(2) (just v approximate to f), the measurements are much larger than the theoretical results. Also, we have measured the electromagnetic wave power attenuation value under the magnetic field and without a magnetic field. The result indicates that the value measured under the magnetic field shows a distinct improvement.
关键词	Microwave Plasma Shock Tube
收录类别	SCI ; EI ; CSCD
语种	英语
WOS记录号	WOS:000222426500003
WOS研究方向	Engineering ; Mechanics
WOS类目	Engineering, Mechanical ; Mechanics
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/33795
专题	力学所知识产出(1956-2008)
通讯作者	Zhu, NY (reprint author), Chinese Acad Sci, Inst Mech, Lab High Temp Gas Dynam, Beijing 100080, Peoples R China.
推荐引用方式 GB/T 7714	Zhu NY,Li XF,Huang LS,et al. An investigation of electromagnetic wave propagation in plasma by shock tube[J]. Acta Mechanica Sinica,2004,20,3,:212-218.
APA	竺乃宜,Li XF,Huang LS,余西龙,杨乾锁,&Zhu, NY .(2004).An investigation of electromagnetic wave propagation in plasma by shock tube.Acta Mechanica Sinica,20(3),212-218.
MLA	竺乃宜,et al."An investigation of electromagnetic wave propagation in plasma by shock tube".Acta Mechanica Sinica 20.3(2004):212-218.

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