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在设计行波管时,改变诸如注电流、频率或螺旋线直径之类的设计参量时,其对性能的影响往往并非直接就能判断出来的。本文使用了一定的近似条件使得某些主要设计参量的影响比较明显。可以看到,在此近似范围内,增益与螺旋线半径的乘积值仅决定于注导流系数和被尺寸所决定的因子 F。在尺寸已定的情况下(确定了所有径向尺寸的比例),可以从γa 和电子注导流系数求得 C 和 QC,从而可以作出 C、QC 及单位长度增益的通用图。如果γa、导流系数和管子尺寸保持不变,则行波管的射频特性也就不变。根据这一特点就能导出行波管的缩放方程,本文中对这类问题作了阐述。
When designing a traveling wave tube, changing the design parameters such as current, frequency, or helix diameter can often not be directly affected by performance. In this paper, some approximate conditions are used to make the influence of some major design parameters more obvious. It can be seen that within this approximate range, the product of the gain and the helix radius depends only on the injection flux coefficient and the size-dependent factor F. In the case of a given size, which determines the ratio of all radial dimensions, C and QC can be derived from the γa and electron-induced flow conductivity coefficients so that a generalized plot of C, QC and unit length gains can be made. If γa, flow conductivity and tube dimensions remain the same, then the traveling wave tube radio frequency characteristics will not change. Based on this feature, we can derive the scaling equation of traveling wave tube. In this paper, we describe the problems.