Establishment of a model for interpretation and correction tools for BESSY II

From the very beginning of the commissioning of the Synchrotron Radiation facility BESSY II, work has been facilitated by online interpretation and correction procedures that utilise a commonly accessible online model of the storage ring optics. The software covers all linear properties like beta functions, orbit correction, tune variation etc. Initially the model has been set up from construction and alignment data and magnetic bench measurements. All relevant parameters are retrieved from a central reference database. During commissioning, the model has been adjusted in several steps, feeding back results from orbit response measurements. The achieved agreement is demonstrated.