Terahertz-Range Gyrodevices of Planar Geometry

For drastic increase in the output power of shortwavelength gyrotrons, we suggest to use the planar scheme with a sheet electron beam and transverse (with respect to the electrons translation velocity) electromagnetic energy extraction. The main advantage of this scheme comparing to the conventional cylindrical geometry is the possibility of effective mode selection over the open transverse coordinate in combination with radiation out-coupling, which leads to substantial reduction of Ohmic losses [1, 2]. The formation of ribbon helical electron beam (HEB) in planar magnetron-injection gun (MIG) was demonstrated in [3]. In this paper we consider gyrotrons and gyroklystrons of planar geometry driven by sheet electron beams. Possibility of power increasing and selectivity improvement in the terahertz band is shown.