Experimental Investigations on a 500GHz Continuously Frequency-Tunable Gyrotron

A 500 GHz TE ₈₅ mode continuously frequency-tunable gyrotron has been designed, fabricated and investigated experimentally. In the experiment, the gyrotron operates at the second cyclotron harmonic stably. The operating frequency is tuned by means of adjusting the operating magnetic field or the beam energy. The variation of the output power is also investigated. It is found that when the operating magnetic field is changed, the frequency-tuning range is much bigger than that when the beam energy is changed.