Track based alignment procedure for the CBM silicon tracking detector

• Published in: Journal of physics. Conference series Vol. 1390; no. 1; pp. 12122 - 12127
• Main Authors: Das, Susovan, Schmidt, Hans Rudolf
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.11.2019
• Subjects: Algorithms; Alignment; Baryons; Charged particles; Chemical potential; Data structures; Experiments; Misalignment; Phase diagrams; Physics; Sensors; Silicon; Spatial resolution; Tracking systems
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/1390/1/012122

The CBM (Compressed Baryonic Matter) experiment at FAIR is being designed for the study of the QCD phase diagram in the region of the high baryon chemical potential at relatively moderate temperatures. The Silicon Tracking System (STS) is the central detector for momentum reconstruction of the produced charged particles in the CBM experiment. It consists of 8 layers of altogether ∼ 900 double sided silicon micro strip sensors. Limited mechanical precision(> 100μm) during the mounting, temperature differences during the experiment, influence of the applied magnetic field result in misalignment to the detector component positions. Therefore, the intrinsic spatial resolution(∼ 20μm) of the detector components has to be recovered by a track based alignment method. In this conference paper, the current status of implementation of the alignment algorithm is presented. For this work, the GBL (General broken line) track refit model is employed to create the necessary input data structure to provide the input to the standalone PEDE part of the χ2 minimization based MILLEPEDE II alignment algorithm.