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首页> 美国政府科技报告 >Simulation of Cold-Test Parameters and RF Output Power for a Coupled-Cavity Traveling-Wave Tube
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Simulation of Cold-Test Parameters and RF Output Power for a Coupled-Cavity Traveling-Wave Tube

机译：耦合腔行波管冷态参数和射频输出功率的仿真研究

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Procedures have been developed which enable the accurate computation of the cold-test (absence of an electron beam) parameters and RF output power for the slow-wave circuits of coupled-cavity Traveling-Wave Tubes (TWT's). The cold-test parameters, which consist of RF phase shift per cavity, impedance, and attenuation, are computed with the three- dimensional electromagnetic simulation code MAFIA and compared to experimental data for an existing V-band (59-64 GHz) coupled-cavity TWT. When simulated in cylindrical co-ordinates, the absolute average differences from experiment are only 0.3 for phase shift and 2.4 for impedance. Using the cold-test parameters calculated with MAFIA as input, the NASA Coupled-Cavity TWT Code is used to simulate the saturated RF Output power of the TWT across the V-band frequency range. Taking into account the output window and coupler loss, the agreement with experiment is very goood from 60-64 GHz, with the average absolute percentage difference between simulated and measured power only 3.8 . This demonstrates that the saturated RF output power of a coupled-cavity TWT can be accurately simulated using cold-test parameters determined with a three-dimensional electromagnetic simulation code.

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