Abstract
A network of Timepix (TPX) devices installed in the ATLAS cavern measures the Large Hadron Collider (LHC) luminosity as a stand-alone system. The data were recorded from 13-TeV proton–proton 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.
Highlights
A TIMEPIX (TPX) detector network [1] of 16 devices was installed in the ATLAS cavern at CERN
The analysis described in this paper is focused on the precision luminosity determination with the devices TPX02 and TPX12, which are operated with 1-s exposure time and analyzed for hit-counting [8]
The network of TPX devices installed in the ATLAS detector cavern has successfully taken data at Large Hadron Collider (LHC) during Run-2 with 13-TeV proton–proton collisions in 2016
Summary
A TIMEPIX (TPX) detector network [1] of 16 devices was installed in the ATLAS cavern at CERN. The devices operating in hit counting mode were used. These vdM scans serve for an absolute calibration of the TPX luminosity measurements.
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