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Sekalski, P. M.S.

Paper Title Page
WEPMN052 FPGA - based Control System for Piezoelectric Stacks used for SC Cavity's Fast Tuner 2155
  • P. M.S. Sekalski, J. W. Jalmuzna, A. Napieralski
    TUL-DMCS, Lodz
  • L. Lilje, K. P. Przygoda, S. Simrock
    DESY, Hamburg
  • R. P. Paparella
    INFN/LASA, Segrate (MI)
  Funding: We acknowledge the support of the ECRIA under the FP6 program (CARE, contract number RII3-CT-2003-506395), and Polish National Science Council Grant "138/E-370/SPB/6. PR UE/DIE 354/2004-2007"

The SC cavities need a fast tuning system, which is able to adjust the shape during the pulse operation. The first attempts were focused on the compensation of the repetitive and periodic distortion. The algorithms were implemented in Matlab and allow compensating only the Lorentz force detuning. However, the previous solution was too slow to be able to compensate the microphonics. The paper presents recent development in the field. The previously worked out algorithms are implemented in the FPGA-based control system. The SIMCON board is used, which allows to perform parallel, deeply pipelined calculation. The new approach allows integrating the algorithm dedicated for cavity shape control with the LLRF system used for vector sum control. Moreover, the new algorithm for on-line detuning calculation which base on the electromechanical model of the cavity is presented. The system is tested with Module Test Stand (MTS) at DESY with the high gradient cavities (37 MV/m). The active elements are the NOLIAC's and PI's multilayer, low voltage piezostacks. The paper will present the first results from these measurements.