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本文描述一种实验方法,该方法可以正确地确定所需要的参量,以便用皮尔斯的等效传输线模型来计算行波管的小信号增益。使用一根可移动的电磁探针沿着螺旋线和衰减器测量每单位波长的增益并且还测量其初始损耗。根据这些数据可以同时确定增益参量C′和空间电荷参量Q′C′。可以根据每单位波长的增益,由C′值获得增幅波放大参量x′。在C′和Q′C′随电子注与螺旋线半径之比b/a和随导流系数变化的情况下以及增长参量x′随C′和Q′C′变化情况下所获得的值与理论值十分一致。对于不同的C′和Q′C′值初始损耗随螺旋线电压的变化关系已得到验证。最后发现衰减器中的增幅波参量正如场论和等效传输线模型所预料的那样是正值。
This article describes an experimental method that correctly determines the required parameters to calculate the small signal gain of a traveling-wave tube using Pierce’s equivalent transmission line model. A movable electromagnetic probe was used to measure the gain per unit wavelength along the helix and attenuator and also to measure its initial loss. From these data, the gain parameter C ’and the space charge parameter Q’C’ can be determined simultaneously. Amplitude amplification parameter x ’can be obtained from the C’ value based on the gain per unit wavelength. The values obtained for C ’and Q’C with the ratio of electron injection to helix radius, b / a, and with the change of the flow conductivity and the change of the growth parameter x’ with C ’and Q’C’ correspond to The theoretical value is very consistent. The initial losses for different values of C ’and Q’C’ have been verified as a function of helical voltage. Finally, it is found that the amplitudes in the attenuator are positive as predicted by the field theory and the equivalent transmission line model.