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当行波管内有电子注时,就会在管子的输出端、输入端及衰减器处分别引起冷态时所不出现的附加的内部反射。我们称它为“电子反射”,这些反射增加了增益波动。测量电子反射是困难的,所以只能进行计算。本文以皮尔斯行波管参量为函数,推导了电子反射方程式,其结论是电子反射往往要超过实际测得的冷反射值。在具有反向基波耦合腔结构行波管中的电子反射几乎比螺旋线行波管中的电子反射大一个数量级。
When there is an electron injection in the traveling wave tube, additional internal reflections at the output, input and attenuator of the tube are caused, respectively, in the cold state. We call this “electronic reflection,” and these reflections add to the gain fluctuations. Measuring electronic reflections is difficult and can only be calculated. In this paper, we derive the electron reflection equation as a function of Pierce traveling wave tube parameters. The conclusion is that the electron reflection often exceeds the actually measured value of the cold reflection. The electron reflection in a traveling-wave tube with an inverse fundamental-wave coupling cavity structure is almost an order of magnitude larger than the electron reflection in a helical traveling-wave tube.