Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 41: Accelerators and Instrumentation II

HK 41.4: Talk

Tuesday, March 17, 2009, 17:30–17:45, H-ZO 90

Optimization of the ALICE-TRD Software in the High Level Trigger — •Theodor Rascanu — Goethe Universität, Frankfurt, Germany

The High Level Trigger (HLT) system of the ALICE experiment at LHC has a multi-functional design. Though its main application is the triggering and selection of rare physics processes it plays a key role in the first online analysis of data and provides monitoring and quality assurance for the detectors. Due to the demands of an online system the HLT routines have to be both, precise and highly computing time efficient. The HLT has to instantly process a vast amount of data, implying high challenges on the computational infrastructure and framework as well as on the design of the data processing and analysis routines for the detectors.

We will review challenges and concepts in the implementation of the Transition Radiation Detector (TRD) in the ALICE-HLT. Limitations and advantages in a parallel software design for online and offline use will be discussed, concentrating on speed optimization and restrictions by the need for high precision offline routines. The versatility of the system will be demonstrated by introducing an HLT based TRD monitoring tool. The current status of the implementation and the strategy for first physics at the LHC will be presented.