학술논문
Generation of powerful narrow-band 75-GHz radiation in a free-electron maser with two-dimensional distributed feedback.
Document Type
Article
Author
Source
Subject
*FREE electron maser
*NARROW-band radio frequency modulation
*TWO-dimensional models
*ELECTRODYNAMICS
*WAVELENGTHS
*PARTICLES (Nuclear physics)
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Language
ISSN
1063-7850
Abstract
A planar generator based on a free-electron maser (FEM generator) is developed employing a relativistic sheet electron beam (0.8 MeV/1 kA/4 μs) formed by an ELMI accelerator. A hybrid two-mirror resonator consisting of a two-dimensional upstream and a one-dimensional downstream Bragg reflectors is used as the electrodynamic system. The use of two-dimensional distributed feedback implemented in the upstream Bragg structure has made it possible to achieve stable well reproducible single mode generation regime with transverse dimensions of the system of ∼25 × 2.5 wavelengths. Experiments carried out at a frequency of 75 GHz have yielded narrow-band radiation with spectrum width of ∼20 MHz in pulses with a duration of ∼100-200 ns and power of 30-50 MW. [ABSTRACT FROM AUTHOR]