研制了一种用于S波段、7.1%带宽、高平均功率速调管的输出段结构。该结构采用双间隙重叠模耦合腔，利用短槽耦合方式，计算得到耦合槽的尺寸，常规选取两个谐振腔的频率、品质因子及两腔间隙中心之距等参数。根据这些参数加工冷测模型，冷测获得的槽的谐振频率和耦合系数与设计值误差只有2.5%。计算的阻抗矩阵曲线与冷测的相对阻抗曲线趋势基本一致，计算的功率与实际的热测结果均满足峰值输出功率大于1.1 MW、平均输出功率大于22 kW的设计要求。实验结果证明该输出段可达到7.1%的带宽，从而验证了该设计方法的正确性。

The output section used in an Sband high average power klystron with 7.1% bandwidth is investigated. It adopts the twogap overlappingmode coupled cavity which uses the short slot coupled mode. The dimension of the coupled slot is obtained by formula, and the two cavities’ parameters of frequency, quality factor, and two gap centers’ distance are chosen generally. According to the above parameters, the coldtest model is processed. The slot’s resonant frequency and coupling coefficient derived by the cold test have an error of 2.5% compared with the original design values, the calculated impedance matrix curve has the same direction as the coldtest relative impedance curve, and the calculated power and the hottest results satisfy the design requirements of more than 1.1 MW peak power and more than 22 kW average power. It is proved that the output section can achieve the 7.1% bandwidth and its design method is correct.