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研究了先进的YAG技术在新一代投影电视投影管上的应用,以玻璃壳体和YAG发光屏为代表,显示出强大的生命力,并对技术特征、工艺指标、演化趋向和发展前景进行了分析。 相似文献
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本文介绍用一种选择型预聚焦透镜来减小球差。我们采用计算机分析计算来设计电子枪。这种磁聚焦电子枪在束电流为4毫安时能提供0. 2毫米的光点尺寸。 相似文献
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孟现柱 《激光与光电子学进展》2014,51(7):72301
利用数值模拟的方法对双电子束互作用进行了研究。结果显示:当一束由许多微脉冲组成的电子束(I)紧贴另一束由许多微脉冲组成的电子束(II)运动时,电子束(II)产生的移动的空间周期性电场能够迫使电子束(I)中的电子做曲线运动,使电子束(I)中的电子做曲线运动的加速度将会使电子产生电磁辐射。同理,使电子束(II)中的电子做曲线运动的加速度将会使电子产生电磁辐射。把这种由于双电子束互作用产生的辐射称为双电子束互作用辐射。利用准光学谐振腔,可以得到高峰值功率的相干双电子束互作用辐射。 相似文献
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A. E. Fedotov P. B. Makhalov 《Journal of Infrared, Millimeter and Terahertz Waves》2008,29(11):997-1003
A linear and non-linear theory of the orotron with an electron beam inclined with respect to the surface of a periodic structure is presented. The beam inclination provides the possibility of the effective interaction of all particles of thick electron beam with slow evanescent harmonic of the cavity mode. On the basis of obtained analytical expression for the orotron starting current, the possibility to increase the device frequency up to 600 GHz is discussed. According to numerical simulations, the inclination of the beam allows increasing significantly both the electron efficiency and the output power of the device. The project of low-voltage orotron with the operating frequency of 100 GHz and output power of 10 W is proposed. 相似文献
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Failure mechanisms related to gold bonding were determined using the scanning electron microscope, Auger electron spectroscopy, X-ray energy dispersive spectroscopy, electron microprobe analysis, and deuteron probe analysis. Power transistors from different lots were analyzed; there were four types of bond defects. Type I defect is darkened carbon inclusions in the bond area. Type II defect is a carbon buildup region on the posts probably in the form of graphite particles which adhered to the gold plating during processing. Type III defects are adsorbed carbon surface films. Type IV defects are gross discontinuities in the gold plating. Auger electron spectroscopy analysis and electron probe analysis proved that defects I, II, and III are subsurface and that further exposure to time-temperature and stress will result in carbide precipitates and hence cracks at the interface. Deuteron probe (DP) analysis of the same bond area has shown the presence of subsurface carbon (the predominant contaminant) thus verifying the Auger results. Contaminants such as manganese, iron boron, cobalt, nickel, chlorine, and sulfur were detected by energy dispersive X-ray analysis in concentrations of 100 ppM or more. These contaminants result in microcracks and voids which are formed by a time-temperature process. All bond-pull data had a bimodal distribution similar to that reported by Horsting. The bimodal distribution of pull-strength, carbon subsurface inclusions, and excessively high levels of contamination (from the plating bath), all indicate that a contamination-related failure mode exists. 相似文献
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