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The research of FIR-FEL has been undertaken about 10 years in CAEP and first lasing at center wavelength 115·10-6 m was observed in March 2005. The facility consists of RF-gun, alpha magnet, L-band SW accelerator, beam transport line, wiggler, optical cavity and measurement system. At present, a high brightness photo cathode RF-gun is commissioning, the cathode material is Cs2Te. This injector will be used in the FIR-FEL project in the second half of this year. In this paper, the design consideration, the system layout, some experimental results are introduced.
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