Development of a Two-Channel Quasi-Optical Converter for a Multifrequency Gyrotron in the Range of 176–250 GHz

Nowadays, the development of multifrequency high-power subterahertz gyrotrons for electron cyclotron (EC) heating and plasma diagnostics is in great demand. The article examines the prospects of using a special two-channel quasi-optical converter for the output of radiation at several frequencies through two separate windows. The converter was developed by hybrid synthesis and the MoM/electric field integral equation (EFIE) method. The approach is being investigated for the gyrotron with a frequency of 250 GHz and a power of up to 330 kW. The designed system makes it possible to output radiation at up to five frequencies in the range of 176–250 GHz with efficiency at the level of optimized single-frequency gyrotrons.