SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 44: Pixel/LHCb, Si-Strips/CMS

T 44.4: Vortrag

Dienstag, 21. März 2023, 17:45–18:00, REC/C213

High rate measurements of HV-MAPS for a future main tracker — Sebastian Bachmann, •Lucas Dittmann, Maja Lecher, and Ulrich Uwer — Physikalisches Institut, Heidelberg, Germany

The LHCb experiment plans to upgrade its detector during the long shutdown 4 of the LHC to cope with a further luminosity increase at LHCb’s interaction point during Run 5. For this upgrade, the currently installed scintillating fiber tracker will be replaced by the MightyTracker. The MightyTracker consists of an inner part made from silicon pixels sensors and an outer part made from scintillating fibers.

For the silicon sensor part of the MightyTracker, dedicated High-Voltage Monolithic Active Pixels Sensors (HV-MAPS), which are called MightyPix, are proposed. HV-MAPS are produced in commercial High-Voltage CMOS technology, which allows the design of low cost, thin and radiation hard sensors.

The MightyPix sensors in the hottest regions of the MightyTracker will experience a mean particle rate of 125 kHz/mm². To determine possible hit rate limitations of existing HV-MAPS experimentally, rate measurements with ATLASPix3.1 sensors have been performed. The results are compared to theoretical expectations. The ATLASPix3.1 sensor is used as a proxy for the MightyPix sensor, since the pixel readout of both sensors will be structured similarly.