TU Darmstadt, Darmstadt
FZJ, Jülich
The low level RF system for the S-DALINAC was developed 20 years ago and is still in operation. The RF-board converts the 3 GHz signals down to the baseband while the IF-board houses the special analogue control algorithm to control the 20-cell cavities. Both modules were redesigned, built and tested. The modulator and demodulator on the RF-board can be easily changed. Thus cavities operating at frequencies other than the S-DALINAC 3 GHz can be controlled with only minor modifications. A 6 GHz version, needed for a harmonic bunching system at the S-DALINAC and a 324 MHz solution to be used on a room temperature cavity at GSI will be presented. The IF-board is now based on a FPGA. In a first step the old control algorithm was successfully implemented in the FPGA and was already used together with the new RF-board as 1 to 1 copy of the old control system with some improvements. First results gained during the operation on a superconducting cavity will be presented. The flexibility of the FPGA allows now the implementation of optimized new algorithm.
