Microbunch Free Electron Laser Based on Coherent Synchrotron Radiation in the Millimeter Wavelength Region(III. Accelerator, Synchrotron Radiation, and Instrumentation)

概要

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Using a short-bunched beam of electrons from a linear accelerator, we develop a broad band free electron laser (FEL) in millimeter wavelength region. The electromagnetic impulses of coherent synchrotron radiation go back and forth in an open resonator to superpose on the subsequent bunches coherently. The output of the resonator has a quasi-continuous broadband spectrum. The main transverse mode of the resonator is assigned as TEM_<00> from comparison of the observed radial distribution of the radiation intensity with theory. The amplification of radiation due to the superposition is verified from both the comparison of the output intensity of the resonator with spontaneous emission and the dependence of the output intensity on the reflectivity of the resonator. The properties of the FEL are discussed on the basis of a simple theory of the superposition.
東北大学の論文