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Münster 2011 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Instrumentierung XII

HK 61.7: Talk

Thursday, March 24, 2011, 18:00–18:15, HS2

Pattern Recognition for the PANDA GEM-TPC — •Felix Boehmer — TU München

The PANDA fixed target experiment at the future FAIR facility in Darmstadt, Germany, will investigate fundamental questions of non-perturbative QCD. It will make use of a cooled, continuous antiproton beam (impinging on a hydrogen target) with momenta from 1.5 to 15   GeV/c, reaching a pp-annihilation rate of 2 · 107   s−1.

One option for the central tracker of the target spectrometer is a cylindrical, ungated, continuously running Time Projection Chamber (TPC) with GEM-based gas amplification stage. The chamber is designed to be 150   cm long with an outer radius of 41.5   cm and will be read out by ∼ 100.000 pickup electrodes.

In this setup, several thousand tracks will be stored inside the TPC volume at any given time, leading to sustained data rates of ∼ 50  GB   s−1 in the TPC alone. On top of such technical challenges, PANDA is designed to run without a 1st-level hardware trigger, making powerful online data processing indispensable. Most importantly, in order to filter out interesting signatures from the purely time-stamped track data and associate information from different detectors uniquely to distinct physics events, fast and efficient online pattern recognition methods will play a central role.

Several methods, which are presently being studied - testing them on simulated data as well as data recently taken with a large GEM-TPC prototype (over 10.000 readout channels) - will be discussed, complemented by first results from simulated and real events.

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