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A typical problem of gyrotrons operating at the second harmonic of the electron cyclotron frequency is the suppression of parasitic near-cutoff waves excited at the fundamental harmonic. In this paper, we discuss the possibility for the selective excitation of two different second-harmonic waves in a relativistic millimeter-wavelength gyrotron by means of the use of a method for a significant improvement...
We describe two ways of the use in high-harmonic gyrotrons of quasi-regular cavities with short phase correctors. The first one is a significant improvement of the selectivity of the second-harmonic gyrotrons due to the suppression of parasitic near-cutoff fundamental-harmonic waves. The second approach is aimed to solve a typical problem of weakly-relativistic high-harmonics gyrotrons, namely, the...
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