Spurious-mode-suppressing method in cylindrical resonator for high peak power multi-beam klystron

A spurious-mode-suppressing method is introduced in this paper, aiming at increasing frequency interval between operating mode (TM
₃₁₀
mode) and spurious mode (TM
₀₂₀
mode). By means of CST-MWS, we find that the frequency interval can be increased 0.65 GHz in X-band by the method.