Abstract

The successful operation of x-ray free-electron lasers (FELs) such as SPring-8 Angstrom Compact free-electron Laser (SACLA) in Japan provides novel x-ray sources with great properties: an unprecedented peak brilliance, full transverse coherence, and a duration down to a few femto-seconds, which offer great promise for exploring new scientific possibilities in ultrafast science with hard x rays. A split-delay optics (SDO), which can provide two replica FEL pulses with time delay precisely controlled, enables us to investigate ultrafast dynamics induced by intense x rays in currently unreachable time scale of up to nanosecond. A mirror-based SDO using a geometrical splitter [1] has successfully contributed to the progress on ultrafast measurements with soft x-ray FELs. Usage of a similar SDO for hard x-ray FELs, however, includes some problems such as a small critical angle (i.e., a huge system is required) and strong scattering from the mirror edge. We proposed a SDO based on the Bragg diffraction from Bragg-case FZ-Si(220) crystals, in which an FEL pulse is reflected with a large angle and a high spectral reflectivity. Combination with a focusing mirror system enables to generation of a high power density field while precise tuning of crystal angles is required. Here we present the details of the SDO and requirements for overlapping replica beams.

© 2014 Japan Society of Applied Physics, Optical Society of America

PDF Article
More Like This
Status and future of SACLA: the Japan’s X-ray Free-Electron Laser

Makina Yabashi
IW1D.1 International Conference on Ultrafast Structural Dynamics (ICUSD) 2012

Femtosecond time-resolved X-ray absorption spectroscopy by a multichannel spectral detection using a hard X-ray free electron laser

Yuki Obara, Tetsuo Katayama, Yoshihiro Ogi, Takayuki Suzuki, Naoya Kurahashi, Shutaro Karashima, Yuhei Chiba, Yusuke Isokawa, Tadashi Togashi, Yuichi Inubushi, Makina Yabashi, Toshinori Suzuki, and Kazuhiko Misawa
07.Mon.B.7 International Conference on Ultrafast Phenomena (UP) 2014

Two-color XFEL operation at SACLA

Toru Hara
17p_C4_2 JSAP-OSA Joint Symposia (JSAP) 2014

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription