Abstract
Experimental results of a CW, 94 GHz second harmonic gyrotron with a 1.8 T solenoid are presented. The gyrotron operated at the second harmonic cyclotron frequency. Its operational frequency is 94.08 GHz and the operating mode is TE 02 . The required 1.8 T magnetic field was generated by a DC solenoid cooled by water. The power consumption of the solenoid is 28 kW and the driving current is 500 A. The inner bore diameter is 66 mm. The gyrating electron beam was generated by a triode magnetic injection gun. A high efficiency internal quasi-optical mode converter with a pre-bunch quasi-optical launcher was used to separate the wave from the electron beam. In the test, 5 min stable operation was realized. The operational frequency is 94.08 GHz. The output power is 12 kW with an electron beam of 45 kV, 1.7 A. The output efficiency is 15.7% without depressed collector. This is the first time that a W-band continuous operation gyrotron with a 1.8 T solenoid was realized.
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