Abstract
We determine distinctive features of the systems forming helical electron beams (HEBs) for high-power pulsed gyrotrons operated in the submillimeter-wave range. It is shown that they are characterized by a nonparaxial magnetic field in the emitter region, short distances between the cathode and the cavity, and the necessity of supplementing the magnetic system with a cathode coil placed behind the emitter. In a diode-type magnetron injection gun, which forms a boundary beam with a power of up to 4 MW, one can obtain the HEB parameters which are acceptable for the gyrotron operation.
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