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T: Fachverband Teilchenphysik
T 55: Silicon Detectors VI
T 55.3: Talk
Wednesday, March 18, 2026, 16:45–17:00, KH 01.022
Performance Characterisation of LF-MightyPix for the LHCb Mighty Tracker — •Celina Welschoff, Sebastian Bachmann, Lucas Dittmann, Ruben Kolb, David Kuhn, and Ulrich Uwer — Physikalisches Institut, Universität Heidelberg
For Run 5 of the LHC, LHCb will reach an instantaneous luminosity of up to 1.0 · 1034 cm−2 s−1. To cope with this challenging environment the current detector needs to be upgraded. One crucial part is the new main tracker, the Mighty Tracker. It will utilise scintillating fibres in the outer regions and silicon pixel sensors in the innermost region. For that inner region, prototype chips based on the High-Voltage Monolithic Active Pixel Sensor (HV-MAPS) technology have been developed. To fulfil the detector’s requirements and support LHCb’s physics performance, the sensors have to achieve a detection efficiency of > 99 % within the 25 ns bunch crossing period. LF-MightyPix is the first prototype sensor for the Mighty Tracker using the LFoundry process. The previous first and upcoming third prototype are produced with different foundries. Evaluating the performance of LF-MightyPix allows to qualify the LFoundry 150nm HV-CMOS process as possible technology for the Mighty Tracker pixel sensor. LF-MightyPix is a small scale prototype and has a size of 3.5 mm × 4 mm and a pixel size of 100 µ m × 100 µ m . In addition, it features a LHCb compatible readout. In this presentation the key features of LF-MightyPix are outlined and the performance of LF-MightyPix is presented utilising both lab and testbeam results. These results show a detection efficiency of > 99 % within 25 ns, fulfilling the Mighty Tracker requirements.
Keywords: LHCb; Mighty Tracker; Pixel Sensor; HV-MAPS; HV-CMOS