Contributions to the FEL2002 Conference, September 9-13, 2002 in Argonne, IL, USA

The Free-Electron Laser (FEL) at the TESLA Test Facility at DESY operates in the self-amplified spontaneous emissionmode and generates sub-100-fs radiation pulses in the vacuum ultraviolet spectral region. During operation in the saturationregime, radiation pulses with GW peak power are produced. The statistical properties of the FEL radiation have been studiedfor different amplification regimes as well as behind a narrow-band monochromator and found to be in good agreement with theresults of numerical simulations. Information about the spectral and temporal structure of the FEL radiation has been deducedfrom the statistical properties. The pulse duration of the FEL radiation can be varied by tailoring the electron bunch that drivesthe FE