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A pulse prototype of a W-band TE01 mode gyrotron traveling-wave tube (gyro-TWT) amplifier is designed, and it features high gain and broadband capabilities. Theoretical investigation predicts that, when the magnetic injection gun (MIG) is optimized to generate an electron beam of voltage 70 kV, current 3 A, high pitch factor 1.5, and low axial-velocity spread about 5%, the gyro-TWT amplifier is of...
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.
A magnetic cusp gun (MCG) is being developed to generate an axis-encircling electron beam, which is called the large orbit beam, which is going to drive a 0.396-THz fourth-harmonic gyrotron. Developing an MCG imposes crucial challenges on a simultaneously minimizing guiding center deviation and velocity spread of the electron beam, particularly because an ultrahigh magnetic compression ratio is unavoidable,...
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...
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