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T: Fachverband Teilchenphysik

T 115: Detectors 10 (semiconductors)

T 115.4: Vortrag

Freitag, 8. März 2024, 09:45–10:00, Geb. 30.23: 2/1

Sensor Performance of the ATLAS High Granularity Timing Detector — •Theodoros Manoussos^{1, 2}, Xiao Yang¹, Guilherme Saito³, Xiangxuan Zheng⁴, Dominik Dannheim¹, Gregor Kramberger⁵, Stefan Guindon¹, Stefano Manzoni¹, Giulia Di Gregorio¹, and Lucia Masetti² — ¹CERN — ²Johannes Gutenberg-Universität Mainz, Deutschland — ³Universitade de São Paulo, Brasil — ⁴University of Science and Technology of China, Hefei, China — ⁵Institut Jožef Stefan, Ljubljana, Slovenia

The increase of the instantaneous luminosity at the HL-LHC will be a challenge for the ATLAS detector. The pile-up is expected to increase on average to 200 interactions per bunch crossing. To mitigate these effects a High Granularity Timing Detector (HGTD) will be integrated in the end-cap regions of ATLAS, covering a pseudo-rapidity range of 2.4 < |η| < 4.0. HGTD, which also serves as a luminosity monitor, aims for a single track time resolution for MIPs of 30   ps at the beginning of the lifetime, up to 50   ps after a maximum fluence of 2.5 × 10¹⁵   neq/cm². The high precision timing information improves the assignment of tracks the correct vertex. HGTD sensors are based on the Low Gain Avalanche Detector (LGAD) technology. Each sensor is a 15 × 15 array of 1.3 × 1.3   mm LGAD pads. Along with the sensors, an equal amount of Quality Control-Test Structures is produced, to monitor the quality and uniformity of the sensors and extract technology parameters during the production. This contribution presents the status of the sensor quality control and the non-irradiated and irradiated LGAD performance obtained in a series of test-beam campaigns.

Keywords: ATLAS Phase II Upgrade; HGTD; LGAD; Sensor QA/QC; Test Beam