From the operation of an SRFEL to a user facility

Storage ring free-electron lasers (SRFELs) likely have a potentiality for scientific application as a unique light source because of the good coherence and temporal feature in addition to variable wavelength. At the UVSOR, the performance of the SRFEL has been improved aiming at userʹs applications. Recently, an experiment using SRFEL combined with synchrotron radiation (SR) was begun. As the first experiment, the double-resonant excitation of Xe has been investigated by using SR and SRFEL as pump and probe lights, respectively. The relevance of making use of SRFEL for the pump/probe experiment is demonstrated.