We have been developing MIR-FEL driven by an electron linac in Institute of Advanced Energy, Kyoto University. The linac, which consists of a thermionic RF-gun, an s-band accelerator, a bunch compressor, and an undulator, accelerates electron beam up to 40 MeV with micropulse duration of less than 1 ps. The FEL wavelength covers from 5 to 20 μm with several mJ/macropulse has been delivered for users. As an example of the user application, selective phonon excitation in SiC is introduced in this paper. We have been developed a new concept short period undulator. The report on this study will be presented in this paper as well.

Spiral interference patterns between two different harmonic radiations from two tandem-aligned helical undulators were observed by a scanning fiber multi-channel spectrometer and a UV-CCD camera placed at the end of beamline downstream of S1 straight section in UVSOR-III. Using these measurements, various interference patterns such as single, double, and triple spirals were observed which concur with the theoretical predictions for every mode in the right or left circular polarization. The rotation of an interference pattern by rotating a polarizer was also observed. In this article, a theoretical background and a series of experimental results are described for the exotic property of undulator harmonics.

I will report on The International Workshop on Future Linear Colliders (LCWS 14), which was held in Belgrade Serbia, on October 6 to 10. Based on the recommendations of the Science Council of Japan (SCJ), the Academic Expert Committee was established in Ministry of Education, Culture, Sports, Science and Technology (MEXT). Under this committee, ILC Technical Design Report (TDR) Validation Working Group and Particle & Nuclear Physics Working Group are validating the significance of ILC from accelerator, detector, and physics points of view. In such situation of Japan, there were more concrete and realistic discussions for construction of ILC at LCWS 14.