Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Instrumentation

HK 12.6: Talk

Monday, March 19, 2012, 18:00–18:15, P 3

CBM First-Level Event Selector Concept — •Dirk Hutter, Jan de Cuveland, and Volker Lindenstruth — Frankfurt Institute for Advanced Studies, Goethe University, Frankfurt, Germany

The CBM experiment at the future FAIR facility is designed to study QCD predictions at high baryon densities. The CBM First-Level Event Selector (FLES) is the central event selection system of the experiment. Designed as a high-performance computing cluster its task is an online analysis of the physics data at a total data rate of 1 TByte/s. As CBM is based on free-running, self-triggered detectors delivering timestamped data streams, there is no inherent event separation. Thus, classical approaches for global event building and event selection are not applicable. Instead of classical event building, the FLES has to combine the data from approximately 1000 input links to self-contained, overlapping processing intervals and distribute them to compute nodes. A high-bandwidth COTS network as well as dedicated custom FPGA boards providing time-addressed access to buffered data are needed. Subsequently, specialized event selection algorithms analyze these processing intervals in 4-D, identify events, and select those relevant for storage. Depending on the chosen CBM subsystem setup and selection scenario, two-staged interval building and event selection are foreseen.

An overview of the considered FLES architecture and studies on interval building are presented.