Abstract
Abstract The Darmstadt superconducting electron accelerator S-DALINAC became fully operative at the end of 1990. Behind the main linac a free electron laser facility has been set up which will make use of an electron beam of energy between 35 and 50 MeV. In the beginning of 1991 the hybrid undulator was installed and measurements of the B- field show that all design specifications are fulfilled. The optical cavity having a length of 15 m and a Rayleigh length of 1.02 m is set up completely and also a photon beam line was built to transport the beam to the experimental site. Furthermore, the high current injection is implemented and the electron gun has already been used for many hours of beamtime. The electron beam has reached the energy required for FEL operation so that infrared radiation of 1.9 ps duration between 2.5 and 6 μm at a repitition rate of 10 MHz and a peak output power of hundreds of kilowatts will be produced. First measurements of the spontaneous spectrum are scheduled for fall 1991.
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