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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.
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| Source Publication | Acta Mechanica Sinica
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| 2004 | |
| Volume | 20Issue:3Pages:212-218 |
| ISSN | 0567-7718 |
| Abstract | 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. |
| Keyword | Microwave Plasma Shock Tube |
| Indexed By | SCI ; EI ; CSCD |
| Language | 英语 |
| WOS ID | WOS:000222426500003 |
| WOS Research Area | Engineering ; Mechanics |
| WOS Subject | Engineering, Mechanical ; Mechanics |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/33795 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | Zhu, NY (reprint author), Chinese Acad Sci, Inst Mech, Lab High Temp Gas Dynam, Beijing 100080, Peoples R China. |
| Recommended Citation 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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