Frequency-Replaceable Ferroelectric Cathode Gyrotron for the Entire Ka-Band Using Replaceable Resonator


A modular, mid-power, Ka-band frequency (twenty seven–forty GHz) gyrotron is reported. The gyrotron is called a dominant tube for millimeter waves, however once fabricated its frequency changing is limited. During this paper, a gyrotron with a replaceable resonator was designed and built. By a rather straightforward action of resonator replacement, the operating frequency of the gyrotron will get replaced. The use of a ferroelectric cathode supports a fast opening and shutting of the tube for the resonator replacement in but half an hour. With the read of covering a big selection of frequencies, a wide range magnetic field pulsed copper solenoid was designed, supporting the gyrotron operation on either the fundamental or the second harmonic of the electron-cyclotron frequency. The gyrotron style is predicated on a ferroelectric electron gun designed and engineered to produce the acceptable electron beam to a wide range of resonators, operating at the elemental or at the second harmonic. The gyrotron with 2 differently designed resonators has been created and tested in the TE01, TE21, and TE1one modes at 39, thirty one, and twenty seven GHz, respectively. With an accelerating beam voltage of −35 kV and a beam current of – A, an output power of –half dozen kW was obtained at single pulse and at -ns micropulse in - macropulse with % duty cycle. Furthermore, the system was operated with five-s repetition rate for half an hour, and a high stability was measured for all t- e mentioned frequencies.

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