Investigating Polarisation and Shape of Beam Microwave Signals at the ANKA Storage Ring

At the ANKA synchrotron radiation facility measure- ments in the microwave range (10 to 12 GHz) employing a LNB (Low Noise Block), which is the receiving part of a Satellite-TV system, have been carried out. Experiments showedthattheobservedsignaldependsonthelengthofthe electron bunches. Furthermore the temporal shape of the microwave signal depends on the detector’s position along the accelerator. Due the LNB antenna’s sensitivity to po- larisation it was also possible to measure the polarisation along the several ns long signal, revealing polarised and non-polarised regions. This paper describes the experimen - tal setup and summarises the observations of the systematic studies performed with the LNB system.