Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 13: Semiconductor Detectors:Radiation Hardness, new Materials and Concepts
T 13.4: Vortrag
Montag, 21. März 2022, 17:00–17:15, T-H26
Studies of irradiated ATLASpix3.1 sensors for the LHCb MightyTracker — •Jan Hammerich for the LHCb MightyTracker group collaboration — University of Liverpool, Liverpool, United Kingdom
The Mighty Tracker is a proposed upgrade to the downstream tracking system of LHCb for operations at luminosities of up to 1.5 × 1034 cm−2 s−1 starting with the LHC Run 5 data taking period. It foresees the replacement of the most central area of the current scintillating fibre tracker with High Voltage CMOS (HV-CMOS) pixel sensors. HV-CMOS sensors have demonstrated a significant radiation tolerance and good performance making them an ideal choice of technology for the LHCb experiment.
Monolithic Active Pixel Sensors (MAPS) fabricated in HV-CMOS processes provide fast charge collection via drift and allow the implementation of the readout on the same die as the sensitive volume. Due to the use of commercial processes, these sensors can be fabricated at low cost as no hybridisation with bump bonds is required. Since they are not fully depleted, the inactive volume can be thinned away.
A dedicated sensor called the MightyPix is developed for this programme. It is based on the HV-MAPS families MuPix and ATLASpix and tailored to the requirements of LHCb. To demonstrate the feasibility of this technology for the LHCb environment, ATLASpix3.1 sensors have been irradiated. These sensors are studied in terms of time resolution and power dissipation in a temperature controlled environment.