Paper |
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PT17 |
Impedance-Matching-Transformer for Capacitive Pick-Ups
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208 |
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- J. Schölles, W. Kaufmann
GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
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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.
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