Using three-dimensional distributed feedback to enhance selectivity of Bragg structures for free-electron lasers operating at sub-THz to THz frequencies

Letter

Using three-dimensional distributed feedback to enhance selectivity of Bragg structures for free-electron lasers operating at sub-THz to THz frequencies

N.Yu. Peskov, E.D. Egorova, A.S. Sergeev, and I.M. Tsarkov

Phys. Rev. Applied 21, L011003 – Published 30 January 2024

Abstract

Bragg resonators forming a three-dimensional distributed feedback have been proposed. To study the electrodynamic properties of resonators of this type, a quasioptical model has been developed within the framework of the coupled-wave approach and their high selective properties have been demonstrated by the three-mode indices under conditions of substantial oversize. Analytical solutions for the eigenmodes’ spectrum of the resonator were found within the framework of the geometric-optics approximation. Results of the theoretical analysis were corroborated by the CST simulations performed in the sub-THz range. The prospects of using such resonators in the project of a superpower free-electron laser, which is currently being constructed in collaboration between BINP RAS (Novosibirsk) and IAP RAS (Nizhny Novgorod) for operation at sub-THz to THz frequencies, are discussed.

Received 4 June 2023
Revised 28 October 2023
Accepted 11 January 2024

DOI:https://doi.org/10.1103/PhysRevApplied.21.L011003

Physics Subject Headings (PhySH)

Masers Radio frequency power sources

Bragg structures Free-electron lasers

Cavity resonators RF, microwave, & terahertz sources

Accelerators & BeamsAtomic, Molecular & OpticalCondensed Matter, Materials & Applied Physics

Authors & Affiliations

N.Yu. Peskov ^1,2,3,*, E.D. Egorova^1,2, A.S. Sergeev¹, and I.M. Tsarkov^1,3

¹Institute of Applied Physics, Russian Academy of Sciences, 46 Ulyanova Str., 603950 Nizhny Novgorod, Russia
²Budker Institute of Nuclear Physics, Russian Academy of Sciences, 11 Lavrentieva Ave., 630090 Novosibirsk, Russia
³Lobachevsky State University of Nizhny Novgorod, 23 Gagarina Ave., 603022 Nizhny Novgorod, Russia