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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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