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capacitive pick-up

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PT17 Impedance-Matching-Transformer for Capacitive Pick-Ups BPM, diagnostics, longitudinal transfer function, impedance matching transformer, SIS, single bunch 208
 
  • J. Schölles, W. Kaufmann
    GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
  The transfer line from the GSI heavy ion synchrotron (SIS) to the experimental set ups is equipped with segmented capacitive pick-ups for beam position measurement. This beam position measurement will be designed to cover a dynamic range of 160 dB and single-bunch evaluation. For taking measurements with maximum sensitivity the best choice is a high-impedance tap at the pick-up referring to the bunch length of 50...500 ns. Therefore the feeding of 50 Ω coax-cables will be realized by an impedance-matching-transformer located close to the pick-up. It has an impedance >10 kΩ at the primary side and 50 Ω matching at the secondary side with a foreseen bandwidth of 200 MHz. So it is possible to use low noise amplifiers with 50 Ω input in a radiation-safe environment without loading the pick-up with 50 Ω. A specialized impedance-matching-transformer is now under development and the result will be presented.