München 2009 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 79: Beschleunigerphysik 2

T 79.3: Vortrag

Dienstag, 10. März 2009, 17:15–17:30, A213

Microphonics compensation with a FPGA based RF control system at the S-DALINAC* — •Martin Konrad, Asim Araz, Uwe Bonnes, Ralf Eichhorn, Achim Richter, and Norbert Pietralla — Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany

The high Q of the superconducting 3 GHz cavities of the S-DALINAC in combination with microphonic perturbations leads to permanent fluctuations in amplitude and phase of the accelerating field. These fluctuations increase the energy spread of the beam which has to be compensated by a low level RF control system. To meet the required stability the existing analog control system has to be replaced by a digital one.

The digital signal processing is done in a FPGA which allows for different control algorithms. Superconducting cavities are operated in a self-excited loop whereas a generator driven resonator is used for normalconducting cavities. The implementation of these algorithms, measurements for characterization of microphonics, and latest results using the control algorithms with a prototype will be presented.

Furthermore we will report on the features of the improved FPGA board revision. These include real time digital readout at full sampling rate which allows extensive diagnostics.

*Supported by DFG through SFB 634.