Paper |
Title |
Other Keywords |
Page |
IT09 |
Diagnostics in Heavy Ion Machines
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ion, diagnostics, electron, linac |
28 |
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- P. Strehl
GSI, Gesellschaft für Schwerionenforschung, Darmstadt, Germany
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An overview of the measurements of most important beam
parameters in heavy ion machines is given. The special
characteristics of heavy ions concerning the great variety
of parameters with respect to the type of accelerator (linac,
circular machine), the species of accelerated ions as well
as their energy, beam intensity, beam emittance and time
structure are considered. The consequences for the design
of beam diagnostic systems are discussed. Typical examples
of measuring systems are given. Experimental results
taken during the long operating time of the GSI facilities,
covering a wide range of parameters, are reported.
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PS05 |
Recent Improvements of a Cryogenic Current Comparator for nA Ion Beams with High Intensity Dynamics
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ion, pick-up, instrumentation, linac |
109 |
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PS12 |
Performance of the new SPS beam position orbit system (MOPOS)
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ion, pick-up, proton, extraction |
126 |
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- C. Boccard, T. Bogey, J. de Vries, S. Jackson, R. Jones, J.P. Papis, W. Rawnsley, K. Rybaltchenko, H. Schmickler
CERN, Geneva, Switzerland
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The orbit and trajectory measurement system COPOS
of the CERN SPS accelerator has been in operation since
the construction of the machine in 1976. Over the years
the system has been slightly modified in order to follow
the evolving demands of the machine, in particular for its
operation as a p-pbar collider and, since 1991, for the
acceleration of heavy ions.
In 1995 the performance of the system was reviewed
and the following shortcomings were identified:
- lack of turn-by-turn position measurements due to the
1ms integration time of the voltage to frequency
converters used for the analogue to digital conversion (to
be compared with a revolution time of 23 ms),
- ageing effects on the 200 MHz resonating input filters,
which had over the years drifted out of tolerance. As a
consequence the signal to noise ratio, the linearity and
the absolute precision were affected.
- the calibration system based on electromechanical relays
had become very unreliable, such that frequent
calibrations were no longer possible,
- a remote diagnostic for the observation of timing
signals relative to the beam signals was missing.
For the above reasons a large-scale upgrade program
was launched, the results of which are described in the
following sections.
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