Speaker
Description
High-Voltage Monolithic Active Pixel Sensors (HV-MAPS) offer nanosecond level timing in combination with a low material budget making them ideal for tracking detectors in high energy physics. With future experiments aiming for higher luminosities, the HV-MAPS technology has to satisfy strict requirements on time resolution and radiation tolerance.
One such experiment is the proposed LHCb Upgrade II which foresees the use of HV-MAPS in the main tracking system. To study the radiation tolerance of this technology, irradiation studies with different sensors and in particular with TelePix2 have been performed.
The TelePix2 is a full-size HV-MAPS implemented in the 180 nm HV-CMOS process of TSI Semiconductors. It was developed for and is in active use as region-of-interest trigger and timing layer for the beam telescopes at the DESY test beam facility. Each pixel of TelePix2 consist of a large-fill factor deep n-well diode that integrates a charge‑sensitive amplifier and a comparator. The discriminated hits are read out at 1.25 Gbit/s via a hit driven column-drain architecture.
To evaluate their radiation tolerance, TelePix2 sensors have been irradiated with neutrons up to $1\times 10^{15} \,\mathrm{n_{eq}/cm^2}$. This talk will present measurements of the IV-characteristics and the effective detection threshold following irradiation, as well as beam test results on hit detection efficiency and time resolution.
