Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1830780 | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | 2008 | 4 Pages |
Abstract
Cavity-mirror degradation is one of the serious problems especially in short-wavelength storage ring free-electron lasers (FELs). To reduce the degradation problem, we tried to treat the Al2O3/SiO2 mirror, degraded through irradiation by undulator radiation, with both oxygen plasma and thermal annealing. As a result, the optical loss of the degraded mirrors optimized around 200 nm was successfully restored. With such efforts, FEL application experiments are being performed. The recent progress on surface observation using a photoelectron emission microscopy (PEEM) at NIJI-IV is also reported.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Instrumentation
Authors
H. Ogawa, K. Yamada, N. Sei, R. Kuroda, K. Yagi-Watanabe, M. Yasumoto, T. Ohdaira, R. Suzuki,