Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 70: Silicon Detectors VI (MAPS, Mighty Tracker)

T 70.3: Vortrag

Donnerstag, 3. April 2025, 16:45–17:00, VG 0.111

Simulation of Hexagonal Pixels in Monolithic Active Pixel Sensors — •Larissa Mendes — Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany

Monolithic active pixel sensors (MAPS) produced using 65 nm CMOS imaging technology are being investigated for particle physics applications, particularly in tracking detectors to meet the demands of future lepton colliders. The complex silicon doping and non-linear electric fields require precise simulations for sensor performance optimization. This study utilizes a combination of electrostatic field simulations and Monte Carlo techniques to predict the performance of different sensor designs.

A hexagonal pixel grid is explored as an alternative to traditional square or rectangular layouts, and the performance is assessed for various pixel sizes. Hexagonal pixels are particularly interesting because they can reduce electric field edge effects seen in square designs, provide a more homogeneous response over the pixel cell, and allow for a shorter drift path while maintaining adequate area for circuitry in the p-well, as well as reducing the number of neighboring pixels. While results for a thin epitaxial layer of 10 um show limited improvements in quantities like efficiency, cluster size, and spatial resolution, further investigations address design limitations and potential advantages, such as enhanced timing performance.

Keywords: MAPS; monolithic active pixel sensors; silicon; detector; simulation