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过去大多依据经验,预计行波管的增益。假定适当的电子注直径,设直流电流密度为恒定,从而计算出增益。但实际上,电子注截面内电流密度并非恒定,因此,考虑到电流密度分布的计算方法才是正确的。不过,这样的计算方法非常繁杂而不实用。本文提出一种简单的计算方法。对于通过螺旋线慢波结构的实心注,可以发现,在考虑直流电流密度分布情况下而得到的耦合系数和以Herrmann定义的有效直径视为电子注直径而得到的耦合系数相当一致。此外,本文还提出了计算增益时集中衰减器的处理方法,计算了几种有效直径不同
Most of the past based on experience, the expected traveling wave tube gain. Assuming proper electron injection diameter, the dc current density is set constant to calculate the gain. However, in fact, the current density in the electron injection cross-section is not constant, therefore, the calculation method considering the current density distribution is correct. However, this method of calculation is very complicated and impractical. This paper presents a simple calculation method. For a solid injection through a spiral slow-wave structure, it can be found that the coupling coefficient obtained considering the dc current density distribution and the coupling coefficient obtained from the effective diameter defined by Herrmann as the electron-injection diameter are quite consistent. In addition, this paper also proposed a method of calculating the concentration attenuator at the time of gain calculation, calculated several different effective diameters