Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Instrumentation und Anwendungen II

HK 12.6: Talk

Monday, March 10, 2008, 18:00–18:15, 2D

The ALICE High-Level Trigger — •Jochen Thäder for the ALICE-HLT collaboration — Kirchhoff-Institut für Physik, Universität Heidelberg

The High-Level Trigger (HLT) for the heavy ion experiment ALICE is a PC cluster of several 100 nodes, which has to reduce the data rate of up to 25 GB/s to at most 1.25 GB/s before permanent storage. For the ongoing commissioning of the ALICE detector and first year running, the HLT has installed the first 100 nodes, which receive the data from the front-end electronics, as well as the HLT management infrastructure. During the first ALICE cosmic run in December 2007, the HLT was performing online first and second level reconstruction, online data compression, calibration and triggering for the TPC, TRD and DiMuon detectors. Furthermore the interfaces to the other online systems DAQ, DCS and ECS, as well as to the offline condition database have been implemented and used.

The experiences made during the commissioning of the HLT itself and the first ALICE cosmic runs will be presented in this talk.

Work on the ALICE High-Level Trigger has been financed by the German Federal Ministry of Education and Research (BMBF) as part of its program “Förderschwerpunkt Hadronen- und Kernphysik - Großgeräte der physikalischen Grundlagenforschung”.