Speaker
Description
The sPHENIX experiment has achieved a major milestone with the construction and installation of the cutting-edge three-layer Monolithic-Active-Pixel-Sensor (MAPS) based VerTeX detector (MVTX) in April 2023, in preparation for first beam in Spring 2023. The MVTX is the innermost tracking detector, boasting a spatial resolution of 5 $\mu$m and covering 2.5-4.0 cm radially, and a pseudorapidity range of $|\eta|$ <2. With 432 ALPIDE sensors, each containing approximately 0.5M 27 $\mu$m x 29 $\mu$m pixels in an area of 1.5cm x 3.0cm, determining the position of each pixel in the sPHENIX global coordinate system presents a significant challenge. Our first step is to establish the relative position of each sensor in the local MVTX coordinates with an accuracy of better than 5 $\mu$m. To this end, we have developed an AI-ML-based approach to determine the deviations of each sensor's position and orientation from the ideal geometry (dx, dy, dz) in translation and (d$\alpha$, d$\beta$, d$\gamma$) in rotation. In this presentation, we will showcase the status of the MVTX detector's internal alignment based on first-year commissioning data, and discuss its impact on heavy flavor measurements
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