Clustered-Cavity Approach for the Performance Improvement of a Ka-Band Second-Harmonic Gyroklystron Amplifier

摘要

The clustered-cavity approach has been discussed to demonstrate the bandwidth enhancement of a previously reported experimental Ka-band, second-harmonic, two-cavity gyroklystron amplifier. A generalized analytical clustered-cavity approach has been developed and then applied to enhance the bandwidth characteristics of a two-cavity gyroklystron amplifier. To validate the analytical results, the device simulation has also been carried out using commercial PIC simulation code, CST Particle Studio. The saturated output power of similar to 265 kW, the efficiency of similar to 18.4%, and the gain of similar to 17.07dB have been obtained in the case of both, cluster-cavity gyroklystron analysis and simulation. The clustered-cavity gyroklystron bandwidth has been achieved as similar to 56 MHz, which is approximately double that reported using the conventional cavity case, i.e., similar to 28 MHz. The obtained results show that the bandwidth of clustered-cavity gyroklystron is considerably widened along with the small increment in the RF output power, gain, and efficiency of the device.