Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 90: Silicon trackers 4
T 90.3: Talk
Thursday, March 7, 2024, 16:30–16:45, Geb. 30.22: kl. HS B
Charge Collection Studies for HV-MAPS — •Ruben Kolb for the HD-HVMAPS collaboration — Physikalisches Institut Universität Heidelberg
High-Voltage Monolithic Active Pixel Sensor (HV-MAPS) technology, developed for high-rate applications, unites precise spatial and time resolution. It combines active detector volume and readout on one chip. The TelePix1 is an HV-MAPS test chip that realizes amplifier and comparator as in-pixel electronics.
The charge deposition and charge collection process in this sensor is investigated to inform further designs of HV-MAPS. In particular, this talk focuses on disentangling the contribution of drift and diffusion to the signal. To achieve this goal, the Time-over-Threshold (ToT) and cluster size of sensors with varying thicknesses are studied, exploring their dependence on the applied high voltage. Pixel-to-pixel variations necessitate a calibration of the sensors before comparison. The calibrated signal was studied for a 4 GeV electron beam and electrons from a 90Sr source. For both sources, a significant contribution of diffusion to the signal size is observed, especially in the low signal region.
Keywords: HV-MAPS; HV-CMOS; Charge Collection; Pixel Sensors