Luminosity Studies in ATLAS

During the course of this summer I've been tasked with many dierent assignments working with the ATLAS Luminosity Taskforce. My main project was related to updating a PyROOT script that in Run1 was responsible for making comparison plots of the measured luminosity of subsystem detectors at ATLAS, and making it compatible with the new les used to store the data. The main purpose of this script was to enable an easy method for which one could get a quick overview of the measured luminosity over many runs such that one could see the stability of the subsystem detectors. This is useful to determine if there is any issues with the detectors so that one could investigate it further. The comparison plots can now be seen on the 2015 Run Data Preparation webpage

Operation and performance of the ATLAS semiconductor tracker in LHC Run 2

Abstract The semiconductor tracker (SCT) is one of the tracking systems for charged particles in the ATLAS detector. It consists of 4088 silicon strip sensor modules. During Run 2 (2015–2018) the Large Hadron Collider delivered an integrated luminosity of 156 fb-1 to the ATLAS experiment at a centre-of-mass proton-proton collision energy of 13 TeV. The instantaneous luminosity and pile-up conditions were far in excess of those assumed in the original design of the SCT detector. Due to improvements to the data acquisition system, the SCT operated stably throughout Run 2. It was available for 99.9% of the integrated luminosity and achieved a data-quality efficiency of 99.85%. Detailed studies have been made of the leakage current in SCT modules and the evolution of the full depletion voltage, which are used to study the impact of radiation damage to the modules.</jats:p