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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.55: Poster

Montag, 7. März 2005, 16:30–18:00, TU MA141

Hardware-Based Low-Latency Track Reconstruction for the ALICE TRD — •Jan de Cuveland and Volker Lindenstruth — Kirchhoff-Institut für Physik, Universität Heidelberg

The Transition Radiation Detector (TRD) is one of the main detector components of the ALICE experiment at the LHC. One of its primary objectives is to trigger on high momentum electrons.

The trigger complexity is considerable and requires fast event reconstruction. Based on data from 1.2 million analog channels, the reconstruction must be performed within 6 µs to contribute to the Level-1 trigger decision. After preprocessing the analog data and applying pattern-matching algorithms in application-specific chips directly on the detector chambers, the resulting track segments of different chambers must be reassembled three-dimensionally. From the curvature of the reconstructed tracks, the momentum of the originating particle is calculated to finally make the trigger decision. This part of the online processing must be completed in less than 2 µs.

A hardware architecture has been developed which is able to perform the processing of up to 20 000 track segments in the required time by means of massive parallelism. This presentation focuses on an efficient implementation of the low-latency track reconstruction in hardware using FPGA technology.

This work is supported by the BMBF (06HD9551).