Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 90: Silicon trackers 4
T 90.5: Talk
Thursday, March 7, 2024, 17:00–17:15, Geb. 30.22: kl. HS B
In-pixel charge collection study with an epitaxial MALTA2 sensor, a depleted monolithic active pixel sensor — •Lucian Raphael Fasselt — Deutsches Elektronen Synchrotron (DESY), Zeuthen, Germany — Humboldt Universität zu Berlin, Berlin, Germany
MALTA2 is a depleted monolithic active pixel sensor (DMAPS) designed for radiation-hard future tracking application and is produced in the modified Tower Semiconductor 180 nm CMOS technology. The sensing layer of the 36.4×36.4 µ m2 pixels consists of either high resistivity epitaxial or Czochralski silicon. The small collection electrode features a small pixel capacitance and offers low noise. A MALTA beam telescope consisting of multiple sensor planes is used to track minimum ionizing particles with 4.1 µ m spatial and 2.1 ns timing resolution.
In this contribution an epitaxial sensor is characterised with in-pixel resolution in terms of hit detection efficiency and cluster size at fine threshold steps. Data was taken at the CERN SPS test beam campaign in 2023. A reconstruction of the signal amplitude from binary hit data is performed. From there, a two dimensional map of the collected charge is obtained and quantifies the effect of charge sharing at the pixel boundaries. The presented method provides an in-beam alternative to grazing angle studies or Edge-TCT for also determining the depletion depth.
Keywords: Particle tracking detectors; Depleted Monolithic active pixel sensor (DMAPS); Test beam study; In-pixel charge collection; Depletion depth