Münster 2011 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Instrumentierung I

HK 7.1: Vortrag

Montag, 21. März 2011, 14:00–14:15, HS1

Beam test of a GEM-TPC prototype — •Sverre Dørheim — sdorheim@e18.physik.tu-muenchen.de

A Time Projection Chamber (TPC) with a GEM-based read out is one option for the central tracker of PANDA at the Facility for Antiproton and Ion Research (FAIR) in Darmstadt. A TPC offers very good momentum resolution and the ability to do particle ID using precise energy-loss measurements. The suppression of ion backflow intrinsic to GEM-based amplification allows us to operate the TPC an ungated, continuous mode, as required by the quasi-continuous beam in the HESR.

To show the feasibility of such a detector a prototype with a drift length of 725 mm and an outer radius of 300 mm has been built. The pad plane of the detector has 10254 hexagonal read out pads which are read out using 42 front end cards based on the AFTER-T2K chip. A gas mixture of Ar/CO₂ (90/10) was used together with different drift fields ranging from 150 to 350 V/cm.

The GEM-TPC was installed and tested in the FOPI spectrometer at GSI (Darmstadt, Germany) with a 2 %X₀ Al target beeing hit by heavy ion beams of Kr at 1.2 AGeV and Au at 1.0 AGeV, respectively.

A detailed overview of the detector hardware as well as first experimental data from the beam test will be presented.

This work is supported by the German BMBF, the EU 7th framework program, the DFG Cluster of Excellence "Universe", the Maier-Leibnitz Labor der LMU und TU Muenchen, and GSI.