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This paper presents the conceptual design of a W-band high-harmonic gyrotron oscillator with a permanent magnet system. Mode selection, cavity design, beam-wave interaction calculations, electron-optical system, and quasi-optical mode converter output system are described. The gyrotron operates at the third harmonic of the electron cyclotron frequency with the beam interacting with a ...
A W-band reflective gyrotron backward wave oscillator (Gyro-BWO) is fabricated to systematically study the physics of competition between backward wave and forward wave. Two cavities, namely a single cavity and complex cavity, will be tested. Theoretical investigation indicates that the competition in a complex cavity is much improved and is capable of generating much stronger efficient radiation.
By utilizing the scatter matrix method, a coaxial Bragg resonator for a cyclotron autoresonance maser (CARM) oscillator operating in the TE61 mode at frequency of 350 GHz, is designed, analyzed, and optimized. Peculiarities of both the reflector and resonator, including the frequency spectra, the resonant frequencies, the quality factors are calculated. Single mode and multimode results are compared,...
Design theory of THz, TM-mode coaxial Bragg reflector is presented, which is expected to construct the cavity in cyclotron autoresonance maser (CARM) oscillators. Specific example operating in a TM6,2 mode at frequency of 350 GHz shows high reflectivity and good frequency selectivity.
A Ka-band gyrotron traveling wave amplifier operating in the TE11 circular mode has been presented. The effects of the parameters such as input power, driver frequency and velocity ratio on the performance of the gyro-TWT ares discussed. The simulation results show that the gain and the bandwidth of the designed Ka-band gyro-TWT is about 54.0 dB and 2.5 GHz with 3 dB bandwidth respectively. The peak...
Multimode conversion is studied for an overmoded 1-D coaxial Bragg resonator. It is demonstrated that 1-D coaxial Bragg resonator can be expected to have excellent mode selectivity under higher-order mode operation at frequency of hundreds giga Hertz.
This paper concerns the design of a new kind coaxial Bragg resonator for a cyclotron autoresonance maser oscillator, which operates in TE11 mode at a frequency of 250 GHz. Two different Bragg reflectors with sinusoidal ripples have been employed in the resonator to improve the mode selectivity. For the upstream reflector, both the outer wall and the inner rod are properly corrugated to suppress the...
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