一种矩形截面切伦柯夫脉塞金属周期慢波结构的分析方法

分析了矩形截面切伦柯夫脉塞周期金属慢波结构的色散特性，以及结构参数的变化对色散曲线的影响。为避免慢波结构两端突变引起的反射振荡，采用等效电路法分析了用于连接光滑波导和慢波结构的渐变段。将线性形、两段形和指数形的渐变段进行了比较。指数形渐变段末端的功率反射系数最小, 并且整体的变化最平缓，因此可将其作为实现慢波与快波间转换的较优选择。分析了频率和实际加工误差对指数形渐变段功率反射系数的影响: 在频率较小时，功率反射系数也较小;固定频率下,较小的加工误差能使交界处功率反射系数的变化较平缓。在此基础上设计了一个功率反射系数小于0.01的指数渐变段，实现了工作模式和快波模式之间的良好匹配。与耦合模理论分析方法相比，等效电路方法更为简洁，二者结果相符合。

Abstract

The dispersion characteristics of metal periodic slow-wave structure in rectangular cross-section Cerenkov maser have been analyzed. The effects of the geometrical parameters on the dispersion curves were investigated. In order to avoid the reflect oscillation induced by the changes at two ends of the slow-wave structure, the taper for matching the smooth waveguide and the slow-wave structure was analyzed by use of equivalent circuit method. Through comparing the linear, the two-piece linear and the exponential tapers, we know that the exponential taper gives the lowest total power reflection coefficient at the end, and the total change is mild. So the exponential taper can be used as an optimal solution for transition between slow and fast modes. The effects of frequency and fabrication error to the exponential taper were analyzed. The lower the frequency is, the lower the total power reflection coefficient is. Under the same frequency, the lower fabrication errors smooth the abrupt jumps of the total power reflection coefficient. With this analysis, an exponential taper with a total power reflection coefficient less than 0.01 was designed to attain a good match between the working mode and the fast wave mode. This method is more concise than the coupled mode theory, and the results of the two methods are consistent.

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舒雯, 赵鼎, 王勇. 一种矩形截面切伦柯夫脉塞金属周期慢波结构的分析方法[J]. 强激光与粒子束, 2011, 23(6): 1574. Shu Wen, Zhao Ding, Wang Yong. An analytical method of metal periodic slow-wave structure for rectangular cross-section Cerenkov maser[J]. High Power Laser and Particle Beams, 2011, 23(6): 1574.

一种矩形截面切伦柯夫脉塞金属周期慢波结构的分析方法

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