Bandwidth and gain in stagger-tuned multi-cavity gyroklystrons

Summary form only given. Some radar applications require high-power sources of millimeter-wave radiation with a rather large bandwidth. The power level required has already been achieved in Russian gyroklystrons, however, the bandwidth realized is rather small. As is known, the bandwidth in klystrons can be significantly increased due to stagger tuning. In our paper we studied analytically the effect of stagger tuning on the bandwidth enlargement and gain degradation in multi-cavity gyroklystrons, GKLs. Our approach is based on consideration of short cavities as quasi-point gaps separated by long drift regions. In such a model one accounts for electron energy kicks in cavities and for ballistic bunching in electron phases in drift regions. Thus, the equations for electron motion can be integrated analytically and numerical integration should be done only for calculation of transconductances and transadmittances in the third and subsequent cavities.