Radiation safety aspects of the TESLA test facility, phase 2

The commissioning of the TESLA test facility (TTF) in its second phase of the Deutsches Elektronen-Synchrotron (DESY) in Hamburg, Germany started by the end of 2004. It had been planned to test accelerator components in cold technology and to be operated for users as a vacuum ultraviolet free electron laser (VUV-FEL). The primary electron beam is accelerated to energies up to 1.6 GeV then collimated and fed either into the undulator section or into the bypass line. At their ends the electron beam is directed into a common absorber while the photon radiation such as VUV laser light and synchrotron light enter the FEL experimental hall. Here some radiation safety issues are addressed: beam loss considerations, primary beam containment and bremsstrahlung.