Speaker
Description
Many years ago, the use of a corrugated dechirper for energy-chirp control in a relativistic electron beam was experimentally demonstrated at the Pohang Accelerator Laboratory (PAL). Since then, a lot of efforts have been made at the PAL-XFEL to utilize the dechirper for the electron beam diagnostics and the short pulse generation as well as the removal of energy correlation. Currently, the PAL-XFEL operates the two undulator sections: one for the hard x-ray (HX) and the other for the soft x-ray (SX), both of which employ the corrugated dechirper (vertical streaking at HX while horizontal streaking at SX). Using these dechirpers, we have conducted experiments to generate the short-pulse FEL down to a few femtoseconds via the fresh-slice technique at the hard x-ray regime and to measure the longitudinal phase space (LPS) of electron beam at the soft x-ray line of PAL-XFEL. The results of these experiments using the dechirper will be presented.
