This article is cited in 7 papers

Free-electron maser with high-selectivity Bragg resonator using coupled propagating and trapped modes

N. S. Ginzburg^ab, I. I. Golubev^ab, S. M. Golubykh^ab, V. Yu. Zaslavskii^ab, I. V. Zotova^ab, A. K. Kaminsky^ab, A. P. Kozlov^ab, A. M. Malkin^ab, N. Yu. Peskov^ab, È. A. Perelstein^ab, S. N. Sedykh^ab, A. S. Sergeev<sup>ab

a</sup> Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod
^b Joint Institute for Nuclear Research, Dubna, Moscow region

Abstract: A free-electron maser (FEM) with a double-mirror resonator involving a new modification of Bragg structures operating on coupled propagating and quasi-cutoff (trapped) modes has been studied. The presence of trapped waves in the feedback chain improves the selectivity of Bragg resonators and ensures stable single-mode generation regime at a considerable superdimensionality of the interaction space. The possibility of using the new feedback mechanism has been confirmed by experiments with a 30-GHz FEM pumped by the electron beam of LIU-3000 (JINR) linear induction accelerator, in which narrow-band generation was obtained at a power of $\sim$10 MW and a frequency close to the cutoff frequency of the trapped mode excited in the input Bragg reflector.

Received: 02.04.2010

 English version: Technical Physics Letters, 2010, 36:10, 952–956

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