Project of CW high harmonics double-beam gyrotrons with operating frequencies in the range 0.7–1.0 THz

The concept of a CW THz range gyrotrons operated at the second or third cyclotron harmonic is presented. To suppress the mode competition effects a double beams scheme is applied. The helical electron beams are formed in a double-beam triode magnetron-injection gun (MIG), where both emitters of the electron beams are located on a common cathode of the conventional MIG. Results of numerical simulation of electron beams formation and mode excitation have been presented. The concept makes possible high power (several hundred Watts) single-mode gyrotron operation at 0.7-1.0 THz frequency range at high harmonics.