Open AccessArrival timing diagnostics at a soft X‐ray free‐electron laser beamline of SACLA BL1
Author(s) -
Owada Shigeki,
Nakajima Kyo,
Togashi Tadashi,
Katayama Tetsuo,
Yumoto Hirokatsu,
Ohashi Haruhiko,
Yabashi Makina
Publication year - 2019
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577519002315
Subject(s) - beamline , optics , laser , free electron laser , physics , wavefront , pulse (music) , arrival time , beam (structure) , detector , engineering , transport engineering
An arrival timing monitor for the soft X‐ray free‐electron laser (XFEL) beamline of SACLA BL1 has been developed. A small portion of the soft XFEL pulse is branched using the wavefront‐splitting method. The branched FEL pulse is one‐dimensionally focused onto a GaAs wafer to induce a transient reflectivity change. The beam branching method enables the simultaneous operation of the arrival timing diagnostics and experiments. The temporal resolution evaluated from the imaging system is ∼22 fs in full width at half‐maximum, which is sufficient considering the temporal durations of the soft XFEL and the optical laser pulses.