The effect of the external magnetic field on the higher harmonics formation in the output power spectrum of low-voltage vircator with nonlaminar electron beams

Abstract

Moving operating frequencies towards millimeter- and terahertz-band is one of the actual problems of modern vacuum microwave electronics. One of the well-known methods to increase the operating frequency is the operation at the i-th harmonic. This approach is used, for example, in gyrotrons. In this work, we experimentally study the increasing of the operating frequency by the external magnetic field in low-voltage vircator with nonlaminar electron beams. The formation of the translaminar electron layer by choosing the optimal voltages to the control electrode and the inhibition of the electron beam by the electrostatic field of the collector is used in the proposed design of the low-voltage vircator system. This approach allows us to form the dense bunches in nonlaminar electron beams with characteristics that provide the growth of the amplitude of the higher harmonics in the output spectrum. Several cases with and without an external magnetic field were considered. A comparison of the obtained results has shown that applying an external magnetic field can increase the frequencies of higher harmonics.
The work was supported by the Russian Foundation for Basic Research under grant No. 19-02-00757.

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Andrei Starodubov
Saratov State University
Russia

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