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- T. Tanaka, T. Tanikawa
RIKEN Spring-8 Harima, Hyogo
- T. Asaka, T. Hasegawa, H. Ohashi, S. Takahashi, S. Tanaka
JASRI/SPring-8, Hyogo-ken
- T. Fukui, T. Hara, A. Higashiya, N. Hosoda, T. Inagaki, S. I. Inoue, T. Ishikawa, H. Kitamura, M. K. Kitamura, H. Maesaka, M. Nagasono, T. Ohshima, Y. Otake, T. Sakurai, T. Shintake, K. Shirasawa, H. Tanaka, K. Togawa, M. Yabashi
RIKEN/SPring-8, Hyogo
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At SPring-8, XFEL facility based on the SCSS (SPring-8 Compact SASE Source) concept is now under construction. As a prototype of the XFEL machine, a test accelerator was constructed in 2005. First FEL amplification was observed in June 2006 although SASE saturation was not achieved at that time. This is mainly attributable to large magnetic error components in one of the two undulator segments. In order to achieve saturation, magnetic arrays of the erroneous undulator have been replaced with new ones in August 2007. In September 2007, beam commissioning aiming at SASE saturation at 60 nm, the longest wavelength available at the minimum undulator gap of 3 mm, has been started. The SASE saturation was confirmed in October, by measuring the radiation power and fluctuation as a function of the undulator gap, instead of measureing the gain curve, i.e., the radiation power as a function of the undulator length. Detailed analysis of the measurement results made with a 3-D FEL simulation code suggests that the electron beam emittance does not deteriorate during the bunch compression process. This is a very encouraging result toward realization of the XFEL based on the SCSS concept.
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