Abstract:This study reported the longitudinal compression and extension of an electron bunch by free electron laser (FEL) interaction. By observing coherent edge radiation generated by an FEL facility at Kyoto University, which has the highest extraction efficiency of an FEL oscillation, we found that an electron bunch interacting with a cavity-type linac FEL elongated when a detuning length of an optical cavity was positive. The transition from compression to extension of the electron bunch was bounded by a perfect sy… Show more
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