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对８ｍｍ波段三次谐波复合腔回旋管进行了系统研究。对具有模式转换段的复合腔的特性进行了数值优化计算，在三次回旋谐波下，对电子注与复合腔中的场的互作用进行了非线性自洽数值模拟。设计并研制了三次谐波复合腔回旋管，在注电压Ｖｂ＝４３ｋＶ与磁场４．５ｋＧ下，得到脉冲输出动率大于５０ｋｗ，互作用电子效率为１２％的结果。
The 8mm band third harmonic compound cavity gyro was systematically studied. The characteristics of the composite cavity with mode transition sections are numerically optimized. The nonlinear self-consistent numerical simulation of the interaction between the electron injection and the field in the composite cavity is carried out under the triple-gyro harmonic. The third harmonic complex cavity was designed and developed. The result shows that the pulse output rate is more than 50kw and the interaction electron efficiency is 12% at the voltage of Vb = 43kV and magnetic field of 4.5kG.