Gyrotrons are high powered electron tubes which emit a millimeter wave beam by bunching electrons with cyclotron motion in a strong magnetic field. Typical output powers range from 10s of kilowatts to 1-2 megawatts. Output frequencies range from about 20 to 200 GHz. Gyrotrons can be designed for pulsed or continuous operation. Gyrotron manufacturers include CPI (USA), Gycom (Russia), Thales (EU), and Toshiba (Japan). A prevalent application of gyrotrons is as a source of plasma heating in nuclear fusion research experiments.
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