Alexander Lupu

Liquid argon time projection chambers (LArTPCs) are powerful neutrino detectors because they record both ionization charge and scintillation light, enabling detailed reconstruction of particle interactions. Their performance, especially at low energy, depends on a well-understood and uniform electric drift field. Small field non-uniformities can distort electron drift, change recombination, and bias both energy reconstruction and track topology. This project develops a data-driven calibration workflow for a 50-liter LArTPC using already collected detector data. After per-channel gain equalization and electron-lifetime correction, long through-going cosmic-ray muons are used as straight-track references to identify residual curvature and transverse displacement caused by local field distortions. These observables are combined with charge-yield structure to build a three-dimensional field and displacement map, while scintillation information is used as a timing anchor or cross-check when available. From this map, the analysis derives position-dependent recombination corrections for event reconstruction. The final products are a 3D description of field distortions and a reconstruction-ready calibration procedure that improves the uniformity and stability of the detector response. By focusing on the 50-liter detector, this work provides a controlled test bed for understanding how electric-field non-uniformity affects charge and light measurements in liquid argon and for developing calibration tools relevant to future LArTPC studies.