Karlsruhe 2011 – scientific programme

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T: Fachverband Teilchenphysik

T 83: RF / Instabilitäten

T 83.1: Talk

Tuesday, March 29, 2011, 16:45–17:00, 30.22: 020

Commissioning of the new low level RF control system for the S-DALINAC* — •Martin Konrad, Uwe Bonnes, Christoph Burandt, Ralf Eichhorn, Patrick Nonn, and Norbert Pietralla — Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany

The high quality factor of the superconducting 3 GHz cavities of the S-DALINAC in combination with microphonic disturbances leads to permanent fluctuations in amplitude and phase of the accelerating field. These fluctuations would increase the energy spread of the beam if not compensated by a low level RF control system. In order to meet the stability requirements the existing analog control system had to be replaced by a digital one.

The new system has been installed by now. It converts the 3 GHz signals down to the base band just as the previous analog control system did. Apart from that the signal processing is done in an FPGA which allows for more sophisticated control algorithms. The superconducting cavities are operated in a self-excited loop whereas a generator-driven approach is used for the normal-conducting cavities.

This talk gives an overview over the hard- and software of the new RF control system and reports on results obtained recently.

*Supported by DFG through SFB 634.