CERN Accelerating science

Internal Note and Article
Report number	LHCb-PROC-2013-063 ; CERN-LHCb-PROC-2013-063
Title	The LHCb Online Luminosity Monitoring and Control
Author(s)	Jacobsson, R (CERN) ; Alemany-Fernandez, R (CERN) ; Follin, F (CERN)
Publication	2014
Imprint	15 Oct 2013
Number of pages	4
In:	14th International Conference on Accelerator & Large Experimental Physics Control Systems, San Francisco, CA, USA, 6 - 11 Oct 2013, pp.thcocb05
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; LHCb
Free keywords	detector ; luminosity
Abstract	The LHCb experiment searches for New Physics by precision measurements in heavy flavour physics. The optimization of the data taking conditions relies on accurate monitoring of the instantaneous luminosity, and many physics measurements rely on accurate knowledge of the integrated luminosity. Most of the measurements have potential systematic effects associated with pileup and changing running conditions. To cope with these while aiming at maximising the collected luminosity, a control of the LHCb luminosity was put in operation. It consists of an automatic real-time feedback system controlled from the LHCb online system which communicates directly with an LHC application which in turn adjusts the beam overlap at the interaction point. It was proposed and tested in July 2010 and has been in routine operation during 2011-2012. As a result, LHCb has been operating at well over four times the design pileup, and 95% of the integrated luminosity has been recorded within 3% of the desired luminosity.
Related document	Slides LHCb-TALK-2013-341
Copyright/License	Preprint: (License: CC-BY-4.0)

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