Some Aspects on Beam Transfer Function Estimates and their Integrations

Longitudinal Beam Transfer Function (BTF) measurements are used to determine the energy spectrum in the CERN PS Booster (PSB), where noise , mainly con-sistingof initial structures of the injected beam, affects the results and particularly causes a Base-Line Offset (BLO). Different signal processing methods and their integration are investigated. processing methods and their integration are investigated. Para-metric estimation methods are shown to give much smaller BLO. Further, mea-surements on a coasting proton beam at injection energy also show that the BLO variance cannot be improved by extended measurement times due to excitation levels. The report also gives some practical aspects of BTF measurements with Prediction Error Methods (PEMs).