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T: Fachverband Teilchenphysik
T 28: Silicon Detectors IV (SiPMs, HG timing)
T 28.3: Vortrag
Dienstag, 1. April 2025, 16:45–17:00, VG 1.101
The ATLAS High Granularity Timing Detector: Test-Beam and Test-Bench Results — •Theodoros Manoussos1,2, Xiao Yang1, Giulia Di Gregorio1, Stefano Manzoni1, Dominik Dannheim1, Stefan Guindon1, and Lucia Masetti2 — 1CERN — 2Johannes Gutenberg-Universität Mainz, Germany
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 up to 200 interactions per bunch crossing, resulting in poorer performance of the currently used reconstruction algorithms, in particular in the forward region. 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 correct assignment of tracks to vertices. HGTD sensors are based on the novel Low Gain Avalanche Detector (LGAD) technology. They provide a moderate gain, resulting in fast rise time and large signal-to-noise ratio, required for excellent time resolution. Each sensor is a 15 × 15 array of 1.3 × 1.3 mm2 LGAD pads. A dedicated read-out ASIC, ALTIROC, was developed. ASICs are bump-bonded to sensors forming hybrids. Sensors and hybrids have been extensively tested in test-beam campaigns and with radioactive sources. The recent test-beam and test-bench results for sensors and hybrids before and after irradiation are presented in this talk.
Keywords: ATLAS Phase II Upgrade; HGTD; LGAD; Test-Beam; Test-Bench