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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Instrumentation und Anwendungen

HK 34.2: Talk

Wednesday, March 14, 2007, 14:30–14:45, B

First Online Experiences with the ALICE High Level Trigger — Torsten Alt¹, Sebastian Bablok², Øystein Haaland², Ivan Kisel¹, Volker Lindenstruth¹, Florian Painke¹, Jörg Peschek¹, Sorina Popescu³, Matthias Richter², Dieter Röhrich², •Timm Morten Steinbeck¹, Jochen Thäder¹, and Gaute Øvrebek² — ¹Kirchhoff Institute of Physics, Ruprecht-Karls-University Heidelberg, Germany — ²Institute for Physics and Technology, University of Bergen, Norway — ³CERN, Geneva, Switzerland

During the second half of 2006 the commissioning of the ALICE TPC has been performed using both cosmic and laser events. During this commissioning the High Level Trigger was operational with real data for the first time. Five Linux PCs were used to receive data from six TPC readout partitions from one sector under test. On the PCs the readout of the data was performed using the software components and PCI hardware to be used during ALICE running. After readout online event reconstruction involving cluster-finding and tracking of trajectories in the examined sector was then performed. Raw data as well as the reconstructed data were then sent to an online event display. This was then used to show the reconstructed events in different views. Included were a full 3D view of the detector, different raw data displays, and some histograms. In this talk we will present some of the experiences made during this first operational use of the ALICE HLT.