A 35 GHz second harmonic TE3,1 gyro-peniotron amplifier with a six vane slotted waveguide structure has been designed utilizing an axis-encircling beam (Fig. 1). An efficiency of 40% is predicted for a 70 kV, 3.5A beam with 5% velocity spread and 10% guiding center spread. A two-stage interaction circuit is required due to TE2,1 and TE3,1 gyrotron backward wave oscillations (Fig. 2). Fabrication of input coupler, interaction circuit and gun are underway. This paper includes results of the input coupler design and cold tests of the slotted waveguide interaction circuit.
G.S. Park, G.S. Park,
"35 GHz gyro-peniotron amplifier experiment", Proc. SPIE 1929, 17th International Conference on Infrared and Millimeter Waves, 19296X (14 December 1992); doi: 10.1117/12.2298366; https://doi.org/10.1117/12.2298366