Mode splitting effect in FEMs with oversized Bragg resonators

Autor:	N. Yu. Peskov, A. S. Sergeev, E.A. Perelstein, S. V. Kuzikov, S.N. Sedykh, Alim K. Kaminsky
Rok vydání:	2016
Předmět:	Physics business.industry Phase (waves) Bragg's law Condensed Matter Physics 01 natural sciences Finite element method 010305 fluids & plasmas law.invention Power (physics) Transverse plane Resonator Optics law 0103 physical sciences 010306 general physics business Waveguide Microwave
Zdroj:	Physics of Plasmas. 23:073106
ISSN:	1089-7674 1070-664X
DOI:	10.1063/1.4956445
Popis:	Splitting of the fundamental mode in an oversized Bragg resonator with a step of the corrugation phase, which operates over the feedback loop involving the waveguide waves of different transverse structures, was found to be the result of mutual influence of the neighboring zones of the Bragg scattering. Theoretical description of this effect was developed within the framework of the advanced (four-wave) coupled-wave approach. It is shown that mode splitting reduces the selective properties, restricts the output power, and decreases the stability of the narrow-band operating regime in the free-electron maser (FEM) oscillators based on such resonators. The results of the theoretical analysis were confirmed by 3D simulations and “cold” microwave tests. Experimental data on Bragg resonators with different parameters in a 30-GHz FEM are presented. The possibility of reducing the mode splitting by profiling the corrugation parameters is shown. The use of the mode splitting effect for the output power enhancemen...
Databáze:	OpenAIRE
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