Speaker
Description
A fast orbit feedback system (FOFB) is currently being developed for PETRA IV, the upcoming fourth-generation light source at DESY Hamburg. The performance of the FOFB system depends significantly on the frequency response of the subsystems in the actuator chain, i.e. the corrector magnets, power supplies, cables and vacuum chambers. To characterize these subsystems, a special test bench is being developed that enables both field quality measurements of the PETRA IV correction magnets and the identification of the subsystems of the FOFB actuator chain. The measurement setup comprises a movable table for scanning the position-dependent field profile with a Hall probe and a search coil arrangement for measuring the integrated field. Both probes are connected to a portable high-resolution mixed-signal oscilloscope, which combines a function generator and an oscilloscope into one device. This enables compact and synchronised high-frequency measurements. The setup supports excitation up to several kHz, allowing the frequency-dependent transfer functions of the subsystems to be extracted. Initial results will be presented together with a comparison to the expected response.
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