Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 68: Instrumentation

HK 68.8: Vortrag

Donnerstag, 7. März 2013, 15:45–16:00, HSZ-405

Particle Identification with a large GEM-TPC — •Felix Valentin Böhmer — Technische Universität München

A Time Projection Chamber (TPC) with its low material budget constitutes an almost ideal device for 3-dimensional tracking of charged particles.

The employment of Gas Electron Multiplier (GEM) foils for gas amplification promises to remedy the former limitation of TPCs to low-rate experiments: The intrinsic ion backflow suppression features of GEMs make traditional gating structures dispensable and thus open the possibility of a continuous operation of TPCs even in high-rate environments.

A large prototype (75 cm length, 15 cm radius) of such a GEM-TPC with ∼ 10000 readout channels has been built and successfully used in a physics campaign (π-beam on different targets) at the FOPI experiment at GSI, Darmstadt. From the recorded data, charged particle tracks entering the GEM-TPC are reconstructed using a fully 3-dimensional clustering algorithm and then matched with the surrounding FOPI tracking detectors.

In this talk we present a first analysis of the specific energy loss (dE/dx) of Pions, Kaons and Protons as a function of the particle momentum. Energy loss resolutions as well as separation power for particle identification are discussed.

This work has been supported by the BMBF and the DFG Cluster of Excellence "Universe" (Exc153)