Open AccessSingle‐shot arrival timing diagnostics for a soft X‐ray free‐electron laser beamline at SACLA
Author(s) -
Owada Shigeki,
Nakajima Kyo,
Togashi Tadashi,
Kayatama Tetsuo,
Yabashi Makina
Publication year - 2018
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/s1600577517015284
Subject(s) - beamline , optics , laser , physics , free electron laser , wavefront , pulse (music) , arrival time , beam (structure) , detector , transport engineering , engineering
Arrival timing diagnostics performed at a soft X‐ray free‐electron laser (FEL) beamline of SACLA are described. Intense soft X‐ray FEL pulses with one‐dimensional focusing efficiently induce transient changes of optical reflectivity on the surface of GaAs. The arrival timing between soft X‐ray FEL and optical laser pulses was successfully measured as a spatial position of the reflectivity change. The temporal resolution evaluated from the imaging system reaches ∼10 fs. This method requires only a small portion of the incident pulse energy, which enables the simultaneous operation of the arrival timing diagnostics and experiments by introducing a wavefront‐splitting scheme.