Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 20: Instrumentation V

HK 20.6: Talk

Tuesday, March 11, 2025, 17:00–17:15, SR Exp1A Chemie

TPC cluster shape analysis — •Janis Noah Jäger for the ALICE Germany collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt

An important aspect of the latest ALICE upgrade is the upgrade of the Time Projection Chamber (TPC). The TPC is the main tracking and particle identification device in ALICE. The replacement of the Multi-Wire Proportional Chambers (MWPC) with stacks of four Gas Electron Multiplier (GEM) foils enables a continuous readout of the TPC. This modification demanded a significant upgrade of the entire readout chain, including the front-end cards, data acquisition and distribution, online reconstruction and data compression. Additionally, the entire reconstruction and calibration software underwent a complete rewrite, along with the TPC cluster finding algorithm.

This talk will address the topic of the TPC cluster shape in relation to track and gas parameters. A comparative analysis of Run 3 data with Monte Carlo simulations will provide insight into the characteristic response functions and diffusion coefficients in the ALICE TPC.

Keywords: LHC; ALICE; TPC; Cluster; Monte Carlo