Measurements of luminosity and normalised beam-induced background using the CMS Fast Beam Condition Monitor

CMS Collaboration, CMS Beam and Radiation Group

Research output: Contribution to journalConference articlepeer-review

Abstract

The CMS Beam Conditions and Radiation Monitoring system (BRM) is installed to protect the CMS detector from high beam losses and to provide feedback to the LHC and CMS on the beam conditions. The Fast Beam Condition Monitor (BCM1F), one of the sub-detectors in the BRM system, is installed inside the pixel volume close to the beam pipe and consists of two planes of 4 modules each located 1.8 m away from the IP, on both ends. It uses single-crystal CVD diamond sensors, radiation hard front-end electronics and an optical transmission of the signal. It is designed for single particle rate measurements, detecting both machine induced beam background and collision products on a bunch-by-bunch basis. Presented is the implementation of the normalised online beam-induced background measurement and the online instantaneous luminosity measurement. The method for determining the luminosity from the measured rates, including the absolute calibration using the Van der Meer scan, and the measurement performance will be described.

Original languageEnglish (US)
JournalProceedings of Science
Volume2012-July
StatePublished - 2012
Event36th International Conference on High Energy Physics, ICHEP 2012 - Melbourne, Australia
Duration: Jul 4 2012Jul 11 2012

All Science Journal Classification (ASJC) codes

  • General

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