Single‐shot arrival timing diagnostics for a soft X‐ray free‐electron laser beamline at SACLA. (18th December 2017)

• Record Type: Journal Article
• Authors: Owada, Shigeki; Nakajima, Kyo; Togashi, Tadashi; Kayatama, Tetsuo; Yabashi, Makina
• Is Part Of: Journal of synchrotron radiation. Volume 25:Part 1(2018)
• Page Start: 68
• Page End: 71
• Publication Date: 2017-12-18
• Subjects: X‐ray free‐electron laser -- soft X‐rays -- arrival timing diagnostics; Synchrotron radiation -- Periodicals; Free electron lasers -- Periodicals; 539.73505
• DOI: 10.1107/S1600577517015284
• Languages: English
• ISSNs: 0909-0495

Abstract

Abstract : Arrival timing diagnostics between soft X‐ray free‐electron laser and synchronized optical laser pulses were performed at SACLA BL1. Abstract : 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.