The TESLA test facility FEL: Specifications, status and time schedule

The TESLA Test Facility (TTF) FEL is a user facility under construction at DESY in Hamburg. The radiation wavelength will reach 6 nm, not including the planned higher harmonic radiation generated in a 1 to 1.5 meter long radiator, at a power level of several GW. Specific to the FEL are the low emittance photo injector gun, the bunch compressors, and the undulator with integrated FODO lattice.