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Description
Detectors operated within high radiation environments such as at the HL-LHC will face unprecedented challenges in particle rates and radiation induced damage. Thus, a deep understanding of radiation induced damage in the detector is crucial to ensure the performance requirements are met over the lifetime of the detector. In semiconductor based detectors the radiation induced damage can be categorized into surface and bulk damage. Bulk damage mostly affects the sensor diode itself and surface damage show significant effects on the electronics part of the sensor. Especially in high voltage monolithic sensors active pixel sensors (HV-MAPS) these effects are important to understand, as the sensor diode and readout electronics are integrated in a single substrate. This leads to the necessity of systematic studies of radiation induced damages in HV-MAPS.
Motivating the systematic study of HV-MAPS are the performance and radiation tolerance requirements of Upgrade II of the LHCb experiment. For Upgrade II the central region of the downstream tracking system - Mighty-Tracker - will be equipped with HV-MAPS - called MightyPix. Doses of up to $3 \cdot 10^{14}~1\mathrm{-}\mathrm{MeVn}_{\mathrm{eq}}/\mathrm{cm}^2$ and $40$ MRad are expected in the central region of the detector at the end of Run $5$. Hence, it is crucial to understand the radiation tolerance of HV-MAPS for a long term success of the Mighty-Tracker.
This work presents performance characterization measurements of irradiated HV-MAPS. The performed irradiation campaigns were done using a proton beam at the Bonn cyclotron and photons using an X-ray tube.
The sensor used for the studies is the TelePix2, as the analog part is similar to the MightyPix.
Its performance is characterized by a testbeam campaign at the DESY II testbeam facility and laboratory measurements.
The presented measurements include studies of non-irradiated sensors, a $1 \cdot 10 ^{14}~1-\mathrm{MeVn}_{\mathrm{eq}}/\mathrm{cm}^2$ proton irradiated sensor and a sensor irradiated up to $40$ MRad using photons.
