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Title First Results from the LHC Luminosity Monitors Submitted 08-DEC-09 20:51 (UTC)
Classification 01 Circular Colliders Modified 28-MAY-10 03:22 (UTC)
Presentation Poster
Presenter Simon Mathieu White Paper ID MOPEC021
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Author(s) Alessandro Ratti, Howard S. Matis, William Charles Turner (LBNL, Berkeley, California), Ryoichi Miyamoto (BNL, Upton, Long Island, New York), Enrico Bravin, Simon Mathieu White (CERN, Geneva)
Abstract The Luminosity Monitor for the LHC is ready for operation during the planned 2009-2010 run. The device designed for the high luminosity regions is a gas ionization chamber, that is designed with the ability to resolve bunch by bunch luminosity as well as survive extreme levels of radiation. The devices are installed at the zero degree collision angle in the TAN absorbers +/-140m from the IP and monitor showers produced by high energy neutrons from the IP. They are used in real time as a collider operations tool for optimizing the luminosity at ATLAS and CMS. A photo-multiplier based system is used at low luminosities and also available. We will present early test results, noise and background studies and correlation between the gas ionization and the PMT. Comparison with ongoing modeling efforts will be included.
Word Count: 135  Character Count: 815
Funding Agency This work partially supported by the US DOE through the US LHC Accelerator Research Program (LARP)

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