Fibre optic radiation sensor systems for particle accelerators

Two different fibre optic dosimeter systems based on the radiation-induced increase of fibre attenuation are presented. The systems allow on-line measurement of the accumulated dose along accelerator beam lines ("distributed" sensor") as well as at fixed positions in selected accelerator sections (local sensors). Fibre properties, system layout and results of measurements obtained during operation of the TESLA Test Facility (TTF) at DESY Hamburg are described