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An urge to fill up the mmwave technology gap in the highpower regime, where a large number of civilian and military applications exist, has led to extensive research and development activities in fastwave gyrosources and amplifiers. Although one such gyrosource, namely, the gyrotron is now commercially available for applications such as in plasma heating and material processing, the gyroamplifiers like the gyro klystron and the gyroTWT are still in the laboratory stage of development. The gyroTWT using a nonresonant waveguide supporting propagating waves enjoys a wider bandwidth potential than the gyroklystron supporting stationary waves using a system of resonant cavities. This has aroused considerable research interest in widening the bandwidth of a gyroTWT for applications such as in highresolution radar and high information density communication systems in the mmwave frequency band. The author has explored the discloaded waveguide a structure well known in the slowwave regime for the application such as in the linear accelerator as the interaction structure in the fastwave regime for wideband gyroTWTs.
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