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HK: Fachverband Physik der Hadronen und Kerne

HK 50: Instrumentation XII

HK 50.1: Group Report

Wednesday, March 13, 2024, 17:30–18:00, HBR 19: C 1

The CBM First-level Event Selector — •Jan de Cuveland and Volker Lindenstruth — Frankfurt Institute for Advanced Studies, Goethe University Frankfurt am Main, Germany

The CBM experiment currently under construction at GSI/FAIR 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 computer cluster, its task is an online analysis of the physics data including full event reconstruction at an incoming data rate exceeding 1 TByte/s.

The CBM detector systems are free-running and self-triggered, delivering time-stamped data streams. As there is no inherent event separation, timeslice building takes the place of global event building. The FLES combines the data from approximately 5000 input links to self-contained, overlapping processing intervals and distributes them to compute nodes. It employs a high-bandwidth InfiniBand network as well as dedicated custom FPGA input boards providing time-addressed access to buffered data. Subsequently, specialized algorithms analyze these processing intervals in 4-D, identify events, and select those relevant for storage. The developed hardware and software solutions are already being applied productively on a smaller scale in the mCBM experiment (FAIR Phase-0).

This presentation summarizes the status of the CBM First-level Event Selector project and includes results from recent mCBM campaigns. This work is supported by BMBF (05P21RFFC1).

Keywords: CBM; FLES; DAQ; HLT; Online Computing