| Paper |
Title |
Page |
| PS05 |
Recent Improvements of a Cryogenic Current Comparator for nA Ion Beams with High Intensity Dynamics
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109 |
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- A. Peters, H. Reeg, P. Forck
GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
- W. Vodel, R. Neubert
FSU Jena, Institut für Festkörperphysik, Friedrich Schiller Universität, Jena, Germany
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Former measurements of extracted ion beams from the
GSI heavy ion synchrotron SIS showed large current fluctuations
in the microsecond region with a high peak-to-average
ratio. To adapt our Cryogenic Current Comparator
(CCC) to this time structure the detector’s electronics have
been carefully modified.
The most important improvement of the new DC
SQUID system affects the enlargement of the bandwidth
and the slew rate of the measuring system. In addition the
existing data acquisition system for e.g. SEMs (Secondary
Emission Monitors) was extended to digitize the CCC signals
simultaneously. Measurements of Argon beams will
be shown to demonstrate the improved capabilities of the
upgraded Cryogenic Current Comparator.
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| PS20 |
A current digitizer for ionisation chambers/SEMS with high resolution and fast resoponse
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147 |
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- H. Reeg
GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
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A current-to-frequency converter (CFC), recently
developed, exhibits a response time up to the ms region.
The frequency limit is raised beyond 1 MHz, extending
the linear range by a factor of 100. The conversion
factor reaches 10-13 C/pulse. The converter is
employed, combined with ionization chambers (IC) and
secondary electron emission monitors (SEM), to
measure the intensity of the extracted beam in the
transfer lines adjoining GSI's heavy ion synchrotron
(SIS). Fast intensity fluctuations during the particle
spill can be observed.
Reduced hum and noise pickup, better handling and
mounting flexibility as well as reduced costs are
achieved building up the spill monitoring system with
distributed components.
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