Theoretical and experimental investigations of oversized Ka-band surface-wave oscillator based on 2D periodical corrugated structure

摘要

For spatially-extended relativistic electron beams ofsheet and tubular geometry the use of a two-dimensional(2D) distributed feedback was proposed for providingspatial coherence of radiation and increase the total radia-tion power [1]. Such 2D feedback can be realized in pla-nar and co-axial 2D Bragg structures (resonators) havingdouble-periodic corrugations. Experimental studies ofFEMs based on novel feedback mechanism are performedin Ka-band (coaxial geometry) at the University ofStrathclyde (Glasgow, UK) [2] and in W-band (planargeometry) at the Budker INP RAS (Novosibirsk, Russia)[3] in collaboration with the IAP RAS (N.Novgorod,Russia) and KIT (Karlsruhe, Germany). As a result, nar-row-band multi-MW power radiation was obtained.