For drastic increase in the output power of short- wavelength 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 advan- tage 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 demon- strated 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.
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