Gyrotrons for controlled fusion facilities (CFF) Continuous-wave (CW) gyrotrons Technological setups based on medium-power CW gyrotrons High-power amplifiers of the millimeter wavelength band Electromagnets and superconducting magnets Microwave transmission lines and their components Low-power microwave devices Frequency meters and spectrum analyzers Output windows of gyrotrons, barrier windows for fusion facilities and technological complexes Sub-THz and THz gyrotrons Cathodes