ISSN 0869-6632 (Print)
ISSN 2542-1905 (Online)

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Bakunin V. L., Denisov G. G., Zavolsky N. A., Moiseev M. A. Zones of stable single-mode generation in overmoded gyrotrons. Izvestiya VUZ. Applied Nonlinear Dynamics, 2012, vol. 20, iss. 6, pp. 67-81. DOI: 10.18500/0869-6632-2012-20-6-67-81

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Zones of stable single-mode generation in overmoded gyrotrons

Bakunin Vladimir Lazarevich, Institute of Applied Physics of the Russian Academy of Sciences
Denisov Grigorij Gennadevich, Institute of Applied Physics of the Russian Academy of Sciences
Zavolsky Nikolaj Aleksandrovich, Samara State University
Moiseev Mark Andreevich, Institute of Applied Physics of the Russian Academy of Sciences

During numerical simulations of the model of gyrotron with fixed field-structure, zones of stable single-mode generation of the work mode are analyzed on the plane of parameters «magnetic field – beam current». It is shown that area and sizes of the zones are strongly dependent on the spectral density of eigen-frequencies of the resonator and on number of considered parasit modes. With increase of spectral density the point of highest attainable efficiency of stable single-mode generation shifts to the region of lower currents and simultaneously this value of efficiency decreases. In the region of higher currents stable single-mode generation exists in soft self-excitation regime of the work mode, while in the region of hard self-excitation of the work mode multimode generation with power of parasit modes much less than power of the work mode arises. 

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