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The possibility to use parasitic fluctuation to control the magnetron generation spectrum

Keywords:

A.V. Ermolaev – Ph. D. (Phys.-Math.), Volgograd State Technical University. E-mail: magnetton@rambler.ru
O.A. Olennikova – Undergraduate, Department «Physics», Volgograd State Technical University. E-mail: kovolum@yandex.ru
A.G. Shein – Dr. Sc. (Phys.-Math.), Professor, Department «Physics», Volgograd State Technical. University. E-mail: professor@mail.ru
I.V. Polyakov – Ph. D. (Phys.-Math.), Associate Professor, Department «Physics», Volgograd State Technical University. E-mail: liichkap@mail.ru


Modes of operation the magnetron generator, in which there is an interaction of electron stream with the main signal π mode and side signal mode N/2 + 1 – mode of low power, are studied. Investigations conducted by self-consistent multi frequency model of magnetron generator realized by «large particles» method. The system of model equations includes motion equations in the crossed electrical and magnetic fields; excitation equations of electrodynamics magnetron system; equations modeling thermal electron and secondary emission; the Poisson equation written in cylindrical coordinate system for calculation of field of a space charge. The interaction of kinds of fluctuations is considered in interaction space having regard to electrodynamic characteristics of magnetron generator M 155 with the frequency 2,45 GHz. A characteristic feature the magnetron is the possibility of self-excitation side signal N/2 + 1-mode of low value and frequency 3 GHz. In this connection simultaneous generation of the main and parasitic types of fluctuations, and duration of such process is comparable with an impulse duration of the main fluctuation is possible. As the considered electrodynamic system has negative dispersion, the side mode becomes more high-voltage than the main mode during the operation of the magnetron on a space harmonic m = 0. Therefore the average power of a signal N/2 + 1-mode is approximately three times less than power of signal π mode. When operating at the space harmonic with number m = −1 the N/2 + 1-mode is low-voltage in comparison with π mode therefore the power of generation of a side mode is higher than power of signal π mode.
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