Timepix3 pixel detectors have demonstrated great potential for tracking applications. With 256×256 pixels, 55 μm pitch and improved resolution in time (1.56 ns) and energy (2 keV at 60 keV), they have become powerful instruments for characterization of unknown radiation fields. A crucial pre-processing step for such analysis is the determination of particle trajectories in 3D space from individual tracks. This study presents a comprehensive comparison of regression methods that tackle this task under the assumption of track linearity. The proposed methods were first evaluated on a simulation and assessed by their accuracy and computational time. Selected methods were then validated with a real-world dataset, which was measured in a well-known radiation field. Finally, the presented methods were applied to experimental data from the Large Hadron Collider. The best-performing methods achieved a mean absolute error of 1.99{\deg} and 3.90{\deg} in incidence angle θ and azimuth φ, respectively. The fastest presented method required a mean computational time of 0.02 ps per track. For all experimental applications, we present angular maps and stopping power spectra.
@article{arxiv.2111.00624,
title = {Improved algorithms for determination of particle directions with Timepix3},
author = {Petr Mánek and Benedikt Bergmann and Petr Burian and Declan Garvey and Lukáš Meduna and Stanislav Pospíšil and Petr Smolyanskiy and Eoghan White},
journal= {arXiv preprint arXiv:2111.00624},
year = {2022}
}