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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/62970
Record Status
Checked
Record Id
62970
Title
Measurement of satelite bunches at the LHC
Contributors
A Jeff (Liverpool Univ., and CERN)
,
M Andersen (CERN)
,
A Boccardi (CERN)
,
S Bozyigit (CERN)
,
E Bravin (CERN)
,
T Lefevre (CERN)
,
A Rabiller (CERN)
,
F Roncarolo (CERN)
,
CP Welsch (Cockcroft Inst., and Liverpool Univ.)
,
AS Fisher (SLAC)
Abstract
The RF gymnastics involved in the delivery of proton and lead ion bunches to the LHC can result in satellite bunches of varying intensity occupying the nominally empty RF buckets. Quantification of these satellites is crucial for bunch-by-bunch luminosity normalization as well as for machine protection. We present an overview of the longitudinal density monitor (LDM) which is the principal instrument for the measurement of satellite bunches in the LHC. The LDM uses single photon counting of synchrotron light. The very high energies reached in the LHC, combined with a dedicated undulator for diagnostics, allow synchrotron light measurements to be made with both protons and heavy ions. The arrival times of photons are collected over a few million turns, with the resulting histogram corrected for the effects of the detector's deadtime and afterpulsing in order to reconstruct the longitudinal profile of the entire LHC ring. The LDM has achieved a dynamic range in excess of 105 and a time resolution of 90 ps. Example results are presented and the successful modification of the system to prevent dependence on the transverse beam size is shown.
Organisation
CI
Keywords
Physics
Funding Information
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Language
English (EN)
Type
Details
URI(s)
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Year
Paper In Conference Proceedings
In 3rd International Particle Accelerator Conference (IPAC'12), New Orleans, Louisiana, USA, 20-25 May 2012, (2012).
Cockcroft-12-16.pdf
2012
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