Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 12: Pixel Detectors

T 12.6: Vortrag

Montag, 21. März 2022, 17:30–17:45, T-H25

Pixel front-end masking and DQ monitoring — Marcello Bindi, Jörn Große-Knetter, •Andreas Kirchhoff, and Arnulf Quadt — II. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany

During Run 2 of the LHC, the ATLAS tracking software masked non-working pixel modules for offline reconstruction. The masking itself is applied if a module does not receive hits. To improve track reconstruction the number of holes should be reduced. Holes are defined as intersections of reconstructed tracks with sensitive detector elements that did not result in a hit. They are estimated by comparing the hits-on-track with the intersected modules. Inactive modules are excluded from the hole definition. As a consequence, a masked module is treated in the track reconstruction as if it received always a hit.

The ATLAS tracking group for Run 3 will increase the granularity of the masking (moving from module to single front-ends) in order to reduce the number of pixel holes and increase the tracking efficiency. Hit maps collected at the end of each run are chosen as input for the front-end masking. Due to the detector geometry the masking for the different front ends needs to be optimised individually. This talk will present the corresponding studies.

The second topic of the talk will be data quality monitoring. While taking data it is extremely crucial to check whether the detector performs as expected to avoid loss in data. Therefore different monitoring software exists. This talk will present the updated software GNAM2 and its current status.