High-power free-electron maser operated in a two-mode frequency-multiplying regime

• Published in: Physical review. Accelerators and beams Vol. 19; no. 6; p. 060704
• Main Authors: Peskov, N. Yu, Bandurkin, I. V., Kaminsky, A. K., Kuzikov, S. V., Perelstein, E. A., Savilov, A. V., Sedykh, S. N., Vikharev, A. A.
• Format: Journal Article
• Language: English
• Published: College Park American Physical Society 01-06-2016
• Subjects: Band theory; Free electrons; Frequency analysis; Masers; Multiplication; Oscillators
• ISSN: 2469-9888; 2469-9888
• DOI: 10.1103/PhysRevAccelBeams.19.060704

The frequency multiplication effects in high-power free-electron masers (FEM) with Bragg cavities were studied to provide the advance of the oscillators into short-wavelength bands. Theoretical analysis of frequency-multiplying FEMs was carried out within the framework of the averaged coupled-wave approach. Proof-of-principle experiments were performed based on a moderately relativistic induction linac LIU-3000 (JINR). As a result, an FEM multiplier operated with a megawatt power level in the 6-mm and 4-mm wavelength bands at the second and third harmonics, respectively, was realized. The possibility of using two-mode bichromatic FEMs for powering a double-frequency accelerating structure was discussed.