CERN Accelerating science

Article
Report number	arXiv:1702.00711
Title	Precision Luminosity of LHC Proton-Proton Collisions at 13 TeV Using Hit-Counting with TPX Pixel Devices
Related title	Precision Luminosity of LHC Proton-Proton Collisions at 13 TeV Using Hit-Counting with TPX Pixel Devices
Author(s)	Sopczak, André (IEAP CTU, Prague) ; Ali, Babar (IEAP CTU, Prague) ; Asawatavonvanich, Thanawat (IEAP CTU, Prague) ; Begera, Jakub (IEAP CTU, Prague) ; Bergmann, Benedikt (IEAP CTU, Prague) ; Billoud, Thomas (Montreal U.) ; Burian, Petr (IEAP CTU, Prague) ; Caicedo, Ivan (IEAP CTU, Prague) ; Caforio, Davide (IEAP CTU, Prague) ; Heijne, Erik (IEAP CTU, Prague) ; Janeček, Josef (IEAP CTU, Prague) ; Leroy, Claude (Montreal U.) ; Mánek, Petr (IEAP CTU, Prague) ; Mochizuki, Kazuya (Montreal U.) ; Mora, Yesid (IEAP CTU, Prague) ; Pacík, Josef (IEAP CTU, Prague) ; Papadatos, Costa (Montreal U.) ; Platkevič, Michal (IEAP CTU, Prague) ; Polanský, Štěpán (IEAP CTU, Prague) ; Pospíšil, Stanislav (IEAP CTU, Prague) ; Suk, Michal (IEAP CTU, Prague) ; Svoboda, Zdeněk (IEAP CTU, Prague)
Publication	2017-02-06
Imprint	2017-02-02
Number of pages	10
Note	Presented at the IEEE 2016 Nuclear Science Symposium, Strasbourg, France
In:	IEEE Trans. Nucl. Sci. 64 (2017) pp.915
In:	IEEE Nuclear Science Symposium and Medical Imaging Conference, Strasbourg, France, 29 Oct - 6 Nov 2016, pp.915
DOI	10.1109/TNS.2017.2664664
Subject category	physics.ins-det ; Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Abstract	A network of Timepix (TPX) devices installed in the ATLAS cavern measures the LHC luminosity as a function of time as a stand-alone system. The data were recorded from 13 TeV proton-proton collisions in 2015. Using two TPX devices, the number of hits created by particles passing the pixel matrices was counted. A van der Meer scan of the LHC beams was analysed using bunch-integrated luminosity averages over the different bunch profiles for an approximate absolute luminosity normalization. It is demonstrated that the TPX network has the capability to measure the reduction of LHC luminosity with precision. Comparative studies were performed among four sensors (two sensors in each TPX device) and the relative short-term precision of the luminosity measurement was determined to be 0.1% for 10 s time intervals. The internal long-term time stability of the measurements was below 0.5% for the data-taking period.
Copyright/License	arXiv nonexclusive-distrib. 1.0

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