Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 8: HK+T Joint Session I: Gas Detectors/TPC

HK 8.6: Talk

Monday, March 27, 2017, 18:15–18:30, F 102

Track Reconstruction for the CBELSA/TAPS TPC — •Philipp Bielefeldt, Markus Ball, Jonathan Ottnad, and Bernhard Ketzer — Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, DE

The CBELSA/TAPS Experiment at the ELSA accelerator facility in Bonn is a photo-production experiment that studies the spectrum and properties of baryon resonances. The current set-up is well-suited for the identification of neutral particles. For a future upgrade, a gas-filled Time Projection Chamber (TPC) with Gas Electron Multiplier (GEM) based amplification is under construction. It will allow studies of charged final states and provide improved particle identification capabilities and suppression of low-energetic electron background.

Track reconstruction will be done using GENFIT 2, a sophisticated, experiment-independent tracking framework. It offers an abstract way to describe detector measurements and material handling as well as fitting routines, i. a. a Kálmán fitter. By design, measurement dimensionality and detector plane orientation need not be constrained, making it especially useful for a TPC, where the passage of particles is not measured on predefined planes.

In this talk, the implementation of the GENFIT 2 framework for the CBELSA/TAPS experiment will be discussed. An overview of the pattern recognition and fitting algorithms for the experiment will be given, as well as information on the expected performance of the GEM-TPC upgrade for the CBELSA/TAPS set-up.

Supported by SFB/TR 16.