Recent developments at UVSOR-II

UVSOR-II, a 750 MeV synchrotron light source of 53 m circumference, is now routinely operated with low emittance of 27 nm-rad and with four undulators, two in- vacuum ones and two variably polarized ones. The injector and the beam transport line have been upgraded to be compatible with full energy injection, preparing for the top up operation in near future. Research works on the beam dynamics are in progress, such as ion-trapping or Touschek scattering. A resonator type free electron laser is successfully operational in very wide range, from visible to deep UV, with high average power exceeding 1 W. A femto-second laser system was introduced and the laser transport line was constructed by utilizing a part of the FEL system. Intense coherent terahertz radiation was successfully produced by the laser-electron interaction. Coherent harmonic generation was also demonstrated by using the same laser system.