A DSP-BASED FAST ORBIT FEEDBACK SYSTEM FOR THE SYNCHROTRON LIGHT SOURCE DELTA

A DSP-based Fast Orbit Feedback (FOFB) system has been designed for the synchrotron light facility DELTA. DELTA consists of a 60 MeV linac, the ramped storage ring BoDo as full-energy injector and the 1.5 GeV storage ring Delta. BoDo and Delta have the same dipole, quadrupole and corrector magnet design, the same beam pipe design and the same BPM RF front-ends, therefore BoDo was used as a testbed for the newly developed FOFB hardware and software. Using the fast corrector magnet power sup-plies of BoDo, the FOFB could damp orbit perturbations up to 90 Hz. The envisaged future use of the FOFB for the Delta storage ring will require either the partial or full replacement of the present slow (1 Hz bandwidth) Delta corrector power supplies, or additional fast power supplies with dedicated FOFB corrector magnets. A first test of the FOFB in Delta for local orbit stabilisation at one beamline is in preparation. This paper presents the results of a suc-cessful test of the FOFB at BoDo, where it achieves a cor-rection rate of 4 kHz for a global SVD-based feedback in both planes. The FOFB is based on the ”DeltaDSP ” VME-bus DSP boards that are also used for the BoDo betatron tune feedback [1]