Jl. Xie et al., THE SATURATION OF THE BEIJING FEL, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 358(1-3), 1995, pp. 256-259
The first lasing of the Beijing FEL was reported at the 1993 FEL Confe
rence. After improving the performance of some components, saturation
of the system was achieved in December 1993. The main measures adopted
will be discussed in this report. First, the original undulator was r
eplaced with a new one with better characteristics. Second, back-bomba
rdment of the thermionic cathode microwave gun was reduced by deflecti
ng magnet. With these and other modifications, saturated power output
of 10(8) over the spontaneous emission was obtained. Saturation over t
he wavelength range 9-11 mu m was achieved.