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The theory of the inverted gyrotwystron, a gyrodevice consisting of the input waveguide and output cavity separated by the drift section, is developed. The case of frequency doubling when the input waveguide operates at the fundamental cyclotron resonance and the output cavity operates at the second cyclotron harmonic is analyzed. It is shown that the electron prebunching in the input waveguide provides a better harmonic content in the electron current density than a standard ballistic bunching occurring in gyroklystrons with a short input cavity followed by a long drift section. The dependence of the efficiency and locking bandwidth on the input power and the lengths of input waveguide and drift section is studied. The effect of the electron velocity spread on the locking bandwidth and the electronic efficiency is analyzed.
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Nusinovich et al. (1997) studied this question.
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