Göttingen 2012 – scientific programme

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T: Fachverband Teilchenphysik

T 58: Spurkammern: Gas

T 58.1: Group Report

Monday, February 27, 2012, 16:45–17:05, VG 2.102

Development of a high rate TPC with GEM readout — •Markus Ball — Technische Universität München

The concept of a Time Projection Chamber (TPC) for high rate experiments has been developed. A gating grid can not be used to reduce the ion backflow. Gas Electron Multipliers (GEM) combine the requirements of an excellent spatial resolution with an intrinsic suppression of ions. These key features of a GEM allow a TPC to maintain its excellence performance even in an ungated continuous mode. A large GEM TPC prototype with a diameter of 30.8 cm, a drift length of 72.8 cm and 10.000 readout channels has been built and tested within the low rate FOPI experiment at the GSI. The operation at high interaction rates with overlapping events in a single drift frame requires a continuous readout of the TPC including online feature extraction and and data compression. The reconstruction software then has to identify physics and filter out background events.

A pattern recognition software has been developed and tested within the PANDA framework to cope with the maximal track density of 0.5 cm/cm³ in the TPC. It provides excellent information about kinked tracks or secondary vertices in the TPC to contribute to an online event selection. The concept of a GEM TPC for high rate applications, first results of the GEM TPC prototype within FOPI as well as an outlook for potential application of this concept in other high rate applications will be presented.