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Design and experimental results of a broadband, high power, millimetre-wave gyrotron traveling wave amplifier (gyro-TWA) operating in the 75–110 GHz frequency band and based on a helically corrugated interaction region (HCIR) and cusp electron beam source are presented. The second harmonic cyclotron mode of the electron beam was used to match the dispersion of an eigenwave in the HCIR, achieving energy...
A upgraded W-band corrugated horn including a broadband vacuum window for use in gyro-devices has been designed, constructed and experimentally measured. The horn and multi-layer vacuum window converts a cylindrical TE11 mode into the free space quasi-optical TEM00 mode over the frequency band of 90–100 GHz with a reflection better than −30 dB and a coupling efficiency of ∼99.4%.
A W-band gyrotron travelling wave amplifier (Gyro-TWA) with a cusp electron gun and a helically corrugated waveguide (HCW) is presented. The large orbit electron beam from the cusp gun interacts resonantly with an ideal eigenwave existing in the interaction region based on the cyclotron resonance maser instability. When driven by the 40 keV, 1.5 A electron beam the amplifier was simulated to output...
A quasi-optical mode converter in the form of a corrugated horn has been constructed for a W-band gyrotron traveling wave amplifier (gyro-TWA). The prototype was designed and optimized through analytical and numerical simulations. The horn converts a cylindrical TE11 mode into a free-space TEM00 mode in a frequency band of 90 GHz to 100 GHz. The optimized simulation predicts a return loss better than...
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