RIKEN/SPring-8, Hyogo
Hamamatsu Photonics K.K., Hamamatsu-city
JASRI/SPring-8, Hyogo-ken
The SCSS test accelerator, which was constructed to check feasibility of XFEL/SPring-8, is operated for user experiments using stable EUV SASE. This accelerator provides a high quality electron beam with parameters suitable for power saturation of the EUV SASE, such as a bunch length of 300 fs and a peak current of 700 A. Evaluating the parameters is very important to ensure the stable generation of the SASE. The bunch length measurement systems to evaluate the parameters have been developed. The systems use the rf zero phasing method, the EO sampling method with temporal decoding and an 800 nm laser, and the method of observing OTR (near infrared region) by a FESCA-200 streak camera, which are mature technologies. All the measured bunch lengths were about 300 fs (FWHM), which is consistent with the individual methods. The most important result is that the streak camera with optimum tuning directly measured the temporal structure with femtosecond resolution. This presentation briefly introduces a development plan for a higher-resolution streak camera and a beam monitor system for the XFEL, as well as the experimental set-up and results.
