Precision Measurements of Induced Radioactivity and Absolute Luminosity Determination With TPX Detectors in LHC Proton–Proton Collisions at 13 TeV
Open Access
- 22 May 2018
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Nuclear Science
- Vol. 65 (7), 1371-1377
- https://doi.org/10.1109/tns.2018.2839664
Abstract
A network of Timepix (TPX) devices installed in the ATLAS cavern measures the LHC luminosity as a standalone system. The data were recorded from 13 TeV protonproton collisions in 2016. Using two TPX devices, the number of hits created by particles passing the pixel matrices was counted. Absolute luminosity is determined with the van der Meer scan technique by separating the LHC proton beams and measuring the widths of the beams in low-intensity LHC proton-proton collisions. The exact determination of the activation background contributes to the overall precision of the TPX luminosity measurements. The activation background varies in time due to induced radioactivity at the different positions of the TPX devices in the ATLAS cavern. The activation at a given time depends on the history of the LHC operation. A detailed study of induced radioactivity has been performed to reduce the uncertainty on both the relative and absolute luminosity measurements.Keywords
Funding Information
- Ministry of Education, Youth and Sports of the Czech Republic (LG 15052, LM 2015058)
- Natural Sciences and Engineering Research Council of Canada
- European Regional Development Fund-Project Van de Graaff Accelerator—a Tunable Source of Monoenergetic Neutrons and Light Ions (CZ.02.1.01/0.0/0.0/16_013/0001785)
This publication has 8 references indexed in Scilit:
- Precision Luminosity of LHC Proton–Proton Collisions at 13 TeV Using Hit Counting With TPX Pixel DevicesIEEE Transactions on Nuclear Science, 2017
- Luminosity determination in pp collisions at $$\sqrt{s}$$ s = 8 TeV using the ATLAS detector at the LHCThe European Physical Journal C, 2016
- ATLAS-TPX: a two-layer pixel detector setup for neutron detection and radiation field characterizationJournal of Instrumentation, 2016
- MPX Detectors as LHC Luminosity MonitorIEEE Transactions on Nuclear Science, 2015
- Design, implementation and first measurements with the Medipix2-MXR detector at the Compact Muon Solenoid experimentJournal of Instrumentation, 2011
- The Medipix2-based network for measurement of spectral characteristics and composition of radiation in ATLAS detectorNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2009
- Erratum to “Timepix, a 65 k programmable pixel readout chip for arrival time, energy and/or photon counting measurements” [Nucl. Instr. and Meth. A. 581 (2007) 485–494]Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007
- Timepix, a 65k programmable pixel readout chip for arrival time, energy and/or photon counting measurementsNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2007