A clinotron comprises a leak-tight body, an electron-optic system for generation band electron stream, a flat periodic slowing structure – a comb in the form of an alternate sequence of rectangular slot cavities and rectangular lamels. A wide wall surface of a waveguide, opposite to the comb working surface, is made parallel to the planes of slot cavities bottoms of the periodic structure. The working surface of comb is installed under an acute angle to the axis of paraxial band electron stream, the distance from the corresponding comb side wall to the adjacent waveguide narrow wall is equal to (, an output waveguide device for transferring high frequency energy from the space of interaction to a load is located near the electron-optic system. The waveguide wide wall opposite to the comb working surface is made parallel thereto, the distance from the side wall of comb having slot cavities depth h1 to the adjacent narrow wall is (1(h1 , and from the comb side wall having slot cavities depth h2 to the adjacent narrow wall is h1(2(h2. The bottom of recesses is made parallel to the comb working surface.
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