Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Poster (a)

HK 51.11: Poster

Thursday, April 2, 2020, 16:30–18:30, Zelt

Simulation Of Ionization Energy Loss In Gases — •Philipp Bielefeldt, Ankur Yadav, Markus Ball, and Bernhard Ketzer — Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany

Accurate tracking of charged particles in particle detectors can be achieved with Time Projection Chambers (TPC). A frequently used amplification stage are Micro-Pattern Gaseous Detectors, such as Gas Electron Multipliers (GEM). Examples of such devices include the ALICE GEM-TPC at LHC, and the future charged-particle tracking system in the CBELSA/TAPS experiment. Characterization of the GEM-TPC requires a thorough comprehension of the physics processes involved in signal creation. This can be vastly improved using Monte-Carlo Simulations of all processes that contribute to the detector signal.

A full detector simulation chain is developed based on the Geant4 platform. Geant4 describes physics processes in complementary models tailored for varying requirements. Different energy loss representations are used, including the phenomenological Photoabsorption Ionization model and the Bethe-Bloch energy deposition model developed by the NA49 collaboration.

A comparison of the ionisation energy deposition straggling between different representations is given. The results are compared to experimental data on ionization energy loss and results from microscopic simulations. Monte-Carlo calculations for the spatial distribution of ionization clusters in thin absorbers are presented.