CERN Accelerating science

ATLAS Note
Report number	ATL-DAPR-PROC-2013-001 ; arXiv:1312.6296
Title	Luminosity Monitoring in ATLAS with MPX Detectors
Author(s)	Sopczak, Andre (IEAP CTU, Prague)
Collaboration	on behalf of the ATLAS and Medipix-2 Collaborations
Publication	2014
Imprint	12 Oct 2013
Number of pages	10
Note	Comments: On behalf of the ATLAS and Medipix-2 Collaborations. Contribution to IPRD13, 7-10 October 2013, Siena, Italy. To be published in the proceedings by JINST. 10 pages, 8 figures
In:	JINST 9 (2014) C01027
In:	13th Topical Seminar on Innovative Particle and Radiation Detectors, Sienna, Italy, 7 - 10 Oct 2013, pp.C01027
DOI	10.1088/1748-0221/9/01/C01027
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	Pixel detector, luminosity
Abstract	The ATLAS-MPX detectors are based on the Medipix2 silicon devices designed by CERN for the detection of multiple types of radiation. Sixteen such detectors were successfully operated in the ATLAS detector at the LHC and collected data independently of the ATLAS data-recording chain from 2008 to 2013. Each ATLAS-MPX detector provides separate measurements of the bunch-integrated LHC luminosity. An internal consistency for luminosity monitoring of about 2% was demonstrated. In addition, the MPX devices close to the beam are sensitive enough to provide relative-luminosity measurements during van der Meer calibration scans, in a low-luminosity regime that lies below the sensitivity of the ATLAS calorimeter-based bunch-integrating luminometers. Preliminary results from these luminosity studies are presented for 2012 data taken at $\sqrt{s}=8$ TeV proton-proton collisions.
Copyright/License	Preprint: (License: CC-BY-4.0)

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