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We propose a novel tabletop THz FEL amplifier consisting of a photocathode RF gun, an undulator, and an is-TPG THz seeding system. In the compact FEL amplifier, tunable and narrowband THz seed light generated by the is-TPG device is amplified through FEL interaction with high brightness electron beam in the undulator. Design study and numerical estimation of the performance of the tabletop THz FEL...
A feedback system to stabilize a long-time operation of thermionic cathode RF-gun has been developed in Kyoto University free electron laser (KU-FEL) facility where a 4.5-cell thermionic cathode RF-gun provides electron beam to drive a mid-infrared FEL. Since the back- bombardment effect seriously increases the temperature of the cathode surface and, consequently, increases the beam charge, a stable...
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