Electron masers based on excitation of Talbot-type supermodes

Yu. S. Oparina; N. Yu. Peskov; A. V. Savilov; D. Yu. Shchegolkov

doi:10.1117/12.2579878

17 November 2020 Electron masers based on excitation of Talbot-type supermodes

Yu. S. Oparina, N. Yu. Peskov, A. V. Savilov, D. Yu. Shchegolkov

Proceedings Volume 11582, Fourth International Conference on Terahertz and Microwave Radiation: Generation, Detection, and Applications; 115820I (2020) https://doi.org/10.1117/12.2579878
Event: Fourth International Conference on Terahertz and Microwave Radiation: Generation, Detection, and Applications, 2020, Tomsk, Russian Federation

Abstract

A natural problem arising in the case of realization of a THz electron maser with a high-current relativistic electron beam is the use of an oversized cavity when it is difficult to provide selective excitation of a definite transverse mode. Our idea is to give up working on a fixed transverse mode, and to use excitation of a supermode formed by a fixed set of several transverse modes of an oversized waveguide. We propose to use the Talbot effect to create an oversized microwave system that provides a high Q-factor for this supermode. We present a design of a Free-Electron Maser fed by a 10 MeV / 2 kA / 200 ns electron beam and based on excitation of a Talbot-type supermode at a frequency close to 2 THz. The presentation includes results of our multi-frequency multi-mode simulations of the electron-wave interaction during the spatio-temporal process of formation and amplification of the supermode in an oversized microwave system. The calculated efficiency of this FEM at the level of 5-10% corresponds to the GW level of the output power.

Citation Download Citation

Yu. S. Oparina, N. Yu. Peskov, A. V. Savilov, and D. Yu. Shchegolkov "Electron masers based on excitation of Talbot-type supermodes", Proc. SPIE 11582, Fourth International Conference on Terahertz and Microwave Radiation: Generation, Detection, and Applications, 115820I (17 November 2020); https://doi.org/10.1117/12.2579878

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