| Paper |
Title |
Page |
| PT08 |
The LHC Orbit and Trajectory System
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187 |
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- E. Calvo-Giraldo, C. Boccard, D. Cocq, L. Jensen, R. Jones, J.J. Savioz
CERN, Geneva, Switzerland
- D. Bishop, G. Waters
TRIUMF, Vancouver, Canada
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This paper describes the definitive acquisition system selected for the
measurement of the closed orbit and trajectory in the CERN-LHC and its
transfer lines. The system is based on a Wide Band Time Normaliser (WBTN)
followed by a 10-bit ADC and a Digital Acquisition Board (DAB), the
latter developed by TRIUMF, Canada. The complete chain works at 40 MHz, so
allowing the position of each bunch to be measured individually. In order
to avoid radiation problems with the electronics in the LHC tunnel, all
the digital systems will be kept on the surface and linked to the
analogue front-ends via a single mode fibre-optic connection. Slow
control via a WorldFIP fieldbus will be used in the tunnel for setting
the various operational modes of the system and will also be used to
check power supply statuses. As well as describing the hardware involved,
some results will be shown from a complete prototype system installed on
four pick-ups in the CERN-SPS using the full LHC topology.
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| PT27 |
A 40 MHz Bunch by Bunch Intensity Measurement for the CERN SPS and LHC
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237 |
| |
- H. Jakob, L. Jensen, R. Jones, J.J. Savioz
CERN, Geneva, Switzerland
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A new acquisition system has been developed to allow the measurement of
the individual intensity of each bunch in a 40 MHz bunch train. Such a
system will be used for the measurement of LHC type beams after
extraction from the CERN-PS right through to the dump lines of the
CERN-LHC. The method is based on integrating the analogue signal supplied
by a Fast Beam Current Transformer at a frequency of 40 MHz. This has been
made possible with the use of a fast integration ASIC developed by the
University of Clermont-Ferrand, France, for the LHC-b pre-shower
detector. The output of the integrator is digitised using a 12-bit ADC
and fed into a Digital Acquisition Board (DAB) that was originally
developed by TRIUMF, Canada, for use in the LHC orbit system. A full
system set-up was commissioned during 2002 in the CERN-SPS, and following
its success will now be extended in 2003 to cover the PS to SPS transfer
lines and the new TT40 LHC extraction channel.
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