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T: Fachverband Teilchenphysik

T 20: Detektorsysteme I

T 20.8: Vortrag

Montag, 25. März 2019, 17:45–18:00, ST 4

Noise threshold optimization of SCT strips of the ATLAS detector — •Frank Sauerburger and Karsten Köneke — Albert-Ludwigs-Universität, Freiburg, Deutschland

An optimization study to reduce the effect of noisy strips in the Semi-Conductor Tracker (SCT) of the ATLAS detector is presented. Currently, strips are marked as “noisy” in the 48-hour calibration loop if their average occupancy is above p=1.5%. Hits in masked strips are not considered during reconstruction. The current threshold has been determined for the configuration of Run 1. Due to an increase in the number of pile-up events and a higher center-of-mass energy in Run 2, it is expected that the current masking algorithm is not optimal for Run 2. The masking criterion is studied from the point of view of tracking performance. The barrel residual and the number of tracks are used as figures of merit to assess the tracking performance. Furthermore, an alternative treatment of masked strips is tested. Instead of removing the hit information before reconstruction, the strips are marked as “dead” in order to reduce the number of holes introduced by the masking of noisy strips.