Speaker
Description
The Cooling-storage-ring External-target Experiment (CEE) is a large-acceptance spectrometer designed for the study of nuclear matter under extreme conditions in heavy-ion collisions at intermediate energies. A reliable detector alignment and track-matching procedure is essential for the reconstruction of charged particles and for subsequent physics analyses.
In this work, we present the detector alignment and track-matching study for the CEE tracking system. Cosmic-ray and beam-test data are used to investigate the relative alignment among the Time Projection Chambers (TPCs), Time-of-Flight detectors (TOF), and Multi-Wire Drift Chambers (MWDCs). Straight tracks reconstructed in the TPCs are used as reference trajectories, and the relative translations and rotations of detector components are determined by minimizing the residuals between reconstructed hits and fitted tracks. Both global and local alignment effects are examined, including the consistency between the left and right TPCs and the matching performance between tracking detectors and TOF hits.
The alignment procedure significantly improves the spatial consistency of reconstructed tracks and detector hits. The remaining residual distributions and track-matching performance are evaluated to validate the alignment quality. These studies provide an important calibration basis for CEE beam-test data analysis and for future high-precision measurements with the CEE spectrometer.
