München 2009 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 79: Beschleunigerphysik 2
T 79.4: Vortrag
Dienstag, 10. März 2009, 17:30–17:45, A213
Development of a new low level RF control system for the S-DALINAC — •Asim Araz1, Uwe Bonnes1, Ralf Eichhorn1, Martin Konrad1, Ulrich Laier2, Achim Richter1, and Rolf Stassen3 — 1Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstrasse 9, 64289 Darmstadt — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt — 3Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Straße, 52428 Jülich
The Superconducting DArmstadt electron LINear ACcelerator S-DALINAC has a maximum energy of 130 MeV and beam currents of up to 60 µA. In order to achieve a minimal energy spread of the beam, the impact of microphonic perturbations on the superconducting cavities have to be compensated, resulting in a strict control of amplitude and phase of the cavities. The existing analog RF control system based on a self-exited loop, converts the 3 GHz signals down to the base band. This concept will also be followed by the new digital system currently under development. It is based on an FPGA in the low frequency part, giving a great flexibility in the control algorithm and providing additional diagnostics. For example it is possible to change the operational mode between self-exited loop and generator driven resonator within a second.
We will report on the design concept, the status and the latest results measured with a prototype, including different control algorithms as well as beam loading effects.
*Supported by DFG through SFB 634.