Design of High-Efficient Powerful CW Technological Gyrotron Complex with operating frequency 28 GHz

The project of a first harmonic CW gyrotron with the operating frequency of 28 GHz and an output power more than 20 kW, intended for various technological applications is described. Both magnetic system and the system of the beam-wave interaction are optimized in such a manner as to provide very high (close to 50
^%
) electronic efficiency and at the same time small energy consumption of the “hot” coils. For the last purpose the magnetically shielded coils are used. It allowed both to increase the operating magnetic field up to 1.024 T and so to operate on the first cyclotron harmonic and at the same time to provide reasonable (13 kW) power consumption of the main coil. Operation on the first cyclotron harmonic ensures absence of the spurious modes within the cyclotron frequency band and so allows to increase the output power in some times in comparison with existing at the moment technological gyrotrons operating on the second cyclotron harmonic. Results of optimization of the key gyrotron subsystems such as electron gun, cavity and collector allowing to operate in CW regime are presented.