Author: Inubushi, Y.
Paper Title Page
TUIBNO01
Beamline Instrumentation for Precise Characterization of X-ray FELs  
 
  • M. Yabashi, Y. Inubushi, T. Sato, K. Tono
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
 
  Precise diagnostic instruments for coherent X-ray pulses will be presented. In SACLA XFEL beamline, a high-resolution single-shot spectrometer (*), a timing monitor between XFEL beams and optical laser pulses (**), etc. have been developed and utilized for user experiments. The resolution of the spectrometer was confirmed to be 14 meV and a spectral spike of ~ 100 meV width was measured. The XFEL pulse duration was estimated to be 4.5 - 31 fs from this spectrometer depending on the bunch compression condition (*). The time jitter between an XFEL and an optical laser was appropriately measured to be ~ 100 fs STD by using the timing monitor (**). The design and performance of other beamline instruments will be also presented.
*) Y. Inubushi, et al., Physical Review Letters 109, 144801 (2012)
**) T. Sato, et al., Proceedings of SRI 2012, THIC02 (2012)
 
slides icon Slides TUIBNO01 [5.870 MB]  
 
THIBNO02
Demonstration Of Two-color XFEL Operation and Autocorrelation Measurement at SACLA  
 
  • T. Hara, Y. Inubushi, T. Ishikawa, H. Tanaka, T. Tanaka, K. Togawa, M. Yabashi
    RIKEN SPring-8 Center, Sayo-cho, Sayo-gun, Hyogo, Japan
  • T. Katayama, T. Togashi, K. Tono
    JASRI/SPring-8, Hyogo, Japan
  • T. Sato
    The University of Tokyo, Tokyo, Japan
 
  Recently two-color XFEL operation with a relative wavelength separation of 30 % has been achieved at SACLA in hard x-rays. In the two-color operation at SACLA, a simple and lucid scheme is employed, namely the first and second halves of the undulators are set at different K values. To make a time delay between the two-color photon pulses, a magnetic chicane is installed between the two undulator sections to detour the electron beam. Since the two-color pulses are emitted from the same electron bunch, there is no time jitter and the delay can be finely adjusted up to 40 fs. Two wavelengths can be freely selected in hard x-rays. The photon pulse length of the single-color operation measured by an autocorrelation technique is less than 10 fs (FWHM). The two-color operation of SACLA, which provides femtoseconds-short pulses with a GW-level peak power, is an ideal light source for x-ray pump x-ray probe experiments.  
slides icon Slides THIBNO02 [1.988 MB]