Abstract
Summary form only given, as follows. Theoretically, all benefits of plasma can be saved at rather low plasma density in the electron cyclotron plasma maser or plasma-filled gyrotron. It exploits the cyclotron instability of a gyrating beam in a smooth waveguide filled with a tenuous magnetized plasma. A tenuous magnetized plasma can significantly modify the electromagnetic properties of TE modes splitting their dispersion curves just in the narrow frequency band. In this frequency band, plasma also causes a significant growth of the azimuthal electric field which provides azimuthal bunching of the gyrating electron beam. It will be shown that a rather tenuous plasma can substantially improve the beam-wave coupling, increase bandwidth, tunability, and output power compared to conventional vacuum gyrotrons, whereas all above-mentioned negative effects become less serious compared to the devices of traditional plasma electronics.
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