| Paper |
Title |
Page |
| PT17 |
Impedance-Matching-Transformer for Capacitive Pick-Ups
|
208 |
| |
- 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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| PT32 |
Beam Loss Diagnostics Based on Pressure Measurements
|
251 |
| |
- E. Badura, B. Franczak, W. Kaufmann, P. Horn, H. Reeg, H. Reich-Sprenger, P. Schütt, P. Spiller, K. Welzel, U. Weinrich
GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
|
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| |
The GSI is operating a heavy ion synchrotron, which is currently
undergoing an upgrade towards higher beam intensities. It was discovered
that beam losses induce a significant pressure increase in the vacuum
system. In order to detect the time constants of the pressure increase
and decrease, fast total pressure measurements were put into operation.
With the recently installed partial pressure diagnostics it is also
possible to follow up which types of molecules are released. The
presentation will focus on the different techniques applied as well as on
some measurement results. The potential and difficulties of this
diagnostic tool will also be discussed.
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