Double hit reconstruction in large area multiplexed detectors.

Area of Science:

• Particle Physics Detectors
• High-Energy Physics Instrumentation
• Signal Processing in Physics

Background:

• Tracking detectors are crucial for reconstructing particle trajectories in high-energy physics experiments.
• Multiplexed readout systems in detectors present challenges due to underdetermined systems of linear equations and charge sharing.
• Existing methods often require prior information or extensive calibration, limiting their applicability.

Purpose of the Study:

• To develop a novel, model-independent approach for unfolding particle hit positions in multiplexed tracking detectors.
• To reduce ambiguities arising from charge sharing in multiplexed readout systems.
• To reconstruct particle hit positions with high efficiency using limited readout channels.

Main Methods:

• A regularization technique is employed to mitigate ambiguities caused by charge sharing.
• The method assumes a smooth distribution of single strip charge values on consecutive detector strips.
• The algorithm was tested on a multiplexed Micromegas detector (50 × 50 cm², 1037 strips, 61 readout channels) using cosmic ray events.

Main Results:

• High efficiency was achieved in reconstructing single and double clusters of hits.
• The developed algorithm successfully reconstructs particle hit positions without prior knowledge of their locations.
• Simulations indicate the algorithm's capability to reconstruct isolated hits in events with higher particle multiplicity.

Conclusions:

• The novel approach effectively reconstructs particle hit positions in underdetermined systems typical of multiplexed detectors.
• The method demonstrates robustness and high efficiency, particularly for low-multiplicity events.
• This technique offers a promising solution for improving tracking detector performance with reduced channel count.