OPTICAL FIBRE BEAM LOSS MONITORS FOR STORAGE RINGS AT DELTA

The Dortmund Electron Accelerator (DELTA) is a 1.5 GeV synchrotron light source. Optimisation of the injection efficiency and understanding lifetime limitations due to chamber aperture limitations was necessary to reduce the injection time during runs for synchrotron radiation users. To localise beam losses, a monitor system along the vacuum pipe is required. Optical fibre technique developed for linear accelerators at DESY [1,3] seemed suitable and was adapted to the DELTA storage ring [2].