Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Poster (a)

HK 51.10: Poster

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

Gas gain calibration of the ALICE TPC with X-rays — •Tim Geiger for the ALICE collaboration — Institut für Kernphysik, Goethe-Universität Frankfurt

The ALICE experiment at LHC is a heavy-ion experiment designed to create and study the properties of a so-called quark-gluon plasma (QGP). The QGP is a hot and dense state of matter presumed to be created in heavy-ion collisions. The main tracking and particle identification detector of ALICE is a large volume time projection chamber (TPC). Particle identification is achieved by simultaneous reconstruction of momentum and specific energy loss. To obtain the desired precision, a proper calibration is required. One important calibration is the equalization of topological gain variations over the readout area. The variation can be measured via releasing a fixed amount of charge into the amplification region. So far this was done by releasing radioacitve ⁸³Kr into the gas volume of the TPC. Using X-rays instead could provide a faster and easier way measuring the gas amplification.

In this poster, we present a feasibility study of gas gain calibration via X-rays.

Supported by BMBF and the Helmholtz Association.