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HK: Fachverband Physik der Hadronen und Kerne

HK 3: Instrumentation I

HK 3.2: Talk

Monday, August 30, 2021, 17:00–17:15, H2

Simulations of the X-ray spectrum measured with the ALICE TPC — •Ankur Yadav, Philip Hauer, Philipp Bielefeldt, and Bernhard Ketzer — Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany

The ALICE Time Projection Chamber (TPC) was upgraded with a Gas Electron Multiplier (GEM) readout. In the scope of a commissioning program, several measurements were already conducted. This includes the irradiation of the TPC with an X-ray source. The pulse height spectrum recorded with the new front end electronic showed three distinct peaks on a Bremsstrahlung background. In addition to the characteristic peak of the Ag anode, the second peak could be attributed to fluorescence from the Cu layer of the GEM.

In order to clarify the origin of the third peak, the GEANT4 toolkit was used to simulate the interaction of X-rays and associated secondary particles with the detector gas and the surrounding passive material. A complete detector simulation chain was developed, including drift, diffusion and gas amplification.

In the talk, we will present the comparison of the simulation with the measured data.

Supported by BMBF.