Abstract
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.
Highlights
Free-electron masers (FEMs) based on intense relativistic electron beams stay among the most powerful sources of pulsed microwave radiation
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
In collaboration between the Joint Institute for Nuclear Research (JINR, Dubna) and the Institute of Applied Physics RAS (IAP RAS, Nizhny Novgorod), a high-power narrow-band FEM with Bragg resonator based on the induction linac LIU3000 (JINR) was realized in the 30-GHz frequency band (30-GHz JINR-IAP FEM) [1,2]
Summary
Free-electron masers (FEMs) based on intense relativistic electron beams stay among the most powerful sources of pulsed microwave radiation. High-power free-electron maser operated in a two-mode frequency-multiplying regime
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