Abstract
Since the inauguration in 2012, an X-ray Free Electron Laser (XFEL) facility SACLA has produced a
number of significant achievements ranging in ultrafast chemistry, materials science, biology, and high
energy density physics. A nano-focusing system produces intense XFEL pulses over 1020 W/cm2. The
intense XFEL pulses, which are utilized as a pump source, not a conventional prove, have opened up
studies of x-ray nonlinear phenomena. In the article, a nano-focusing system and its applications at
SACLA are reported.
