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T: Fachverband Teilchenphysik
T 71: Beschleunigerphysik III
T 71.5: Vortrag
Freitag, 7. März 2008, 15:00–15:15, KGI-HS 1019
Development of a new Low Level RF Control for the S-DALINAC — •Martin Konrad1, Asim Araz1, Uwe Bonnes1, Ralf Eichhorn1, Ulrich Laier2, Markus Platz1, and Achim Richter1 — 1Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany — 2Gesellschaft für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany
The high Q of the superconducting 3 GHz cavities of the S-DALINAC in combination with microphonic disturbances lead to permanent changes in amplitude and phase of the accellerating field increasing the energy spread of the beam. To compensate for this a low level RF control is necessary.
The existing analog control based on a self-excited loop has to be replaced by a digital one to meet the required stability. The concept of converting the signals down to the base band is retained. The implementation using an FPGA provides flexibility in the control algorithm and extensive diagnostics. For example switching between the operational modes self-excited loop and generator driven resonator is possible without changing the hardware.
We will report on results observed with a prototype. This includes different control algorithms and beam loading.
*Supported by DFG through SFB 634.