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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/62461
Record Status
Checked
Record Id
62461
Title
Longitudinal density monitor for 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 longitudinal density monitor (LDM) is primarily intended for the measurement of the particle population in nominally empty rf buckets. These so-called satellite or ghost bunches can cause problems for machine protection as well as influencing the luminosity calibration of the LHC. The high dynamic range of the system allows measurement of ghost bunches with as little as 0.01% of the main bunch population at the same time as characterization of the main bunches. The LDM is a single-photon counting system using visible synchrotron light. The photon detector is a silicon avalanche photodiode operated in Geiger mode, which allows the longitudinal distribution of the LHC beams to be measured with a resolution of 90 ps. Results from the LDM are presented, including a proposed method for constructing a 3-dimensional beam density map by scanning the LDM sensor in the transverse plane. In addition, we present a scheme to improve the sensitivity of the system by using an optical switching technique.
Organisation
CI
Keywords
Physics
Funding Information
Related Research Object(s):
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Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Bull Am Phys Soc
15 (2012): 032803.
doi:10.1103/PhysRevSTAB.15.032803
Cockcroft-12-07.pdf
2012
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