Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 71: Detectors VI (Gaseous Detectors)

T 71.4: Vortrag

Donnerstag, 3. April 2025, 17:00–17:15, VG 1.101

Investigation of micro-pixel charge sharing Micromegas detectors — •Nirmal Mathew, Otmar Biebel, Valerio D'Amico, Stefanie Götz, Ralf Hertenberger, Eshita Kumar, Daniel Grewe, Nick Schneider, Chrysostomos Valderanis, and Fabian Vogel — LMU München

Micro-MEsh GAseous Structure (Micromegas) detectors are Micro Pattern Gaseous Detectors (MPGD's) used for their high-rate capability and excellent spatial resolution achieved through narrow amplification gap and fine strip pitch readouts. However, this performance comes at the expense of requiring a large number of readout channels for individual strips. The development and testing of Pixalated Avalanche Detectors (PAD's) are investigated, which leverage charge-sharing principles across multiple pixel layers, alternative to strip-based readouts in Micromegas, to reduce the number of readout channels strongly. Each successive layer is designed with larger pixels than the one below, culminating in a final layer that aggregates charge information to determine the particle hit position. This approach reduces the number of readout channels while maintaining comparable spatial resolution.

Two prototypes were tested: one with five pixel layers, and a hybrid PAD with three layers and novel strip-like readouts. The detectors were calibrated using an Fe-55 source and tested in a hodoscope setup to track cosmic muons. The performance and efficiency of these measurements will be presented, demonstrating the feasibility of PADs as a cost-effective alternative to traditional MPGDs.

Keywords: Micromegas; Charge Sharing; Pixel Readout; Simulation