Gießen 2007 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 28: Instrumentation und Anwendungen

HK 28.4: Vortrag

Mittwoch, 14. März 2007, 12:00–12:15, B

The TRD Super Module Unit and its implementation — •Stefan Kirsch for the ALICE TRD collaboration — Kirchhoff-Institut für Physik, Universität Heidelberg

The Transition Radiation Detector (TRD) of the ALICE Experiment at the LHC provides experimental raw data as well as tracklet information. On basis of the latter, the Global Tracking Unit (GTU) contributes to the Level-1 trigger decision. Providing the possibility to read out both, data and tracklets, at rates up to 2.16Tb/s inflicts high demands on the GTU.
Data is transmitted via 1080 optical fibres and received by the GTU’s Track Matching Units (TMU). In order to operate the GTU, 18 Super Module Units (SMU) decode and monitor control information provided by the TTC (Timing, Trigger and Control) utilising high performance Virtex-4 FPGAs. Further tasks concern the identification and reporting of errors, as well as event matching. Data belonging to multiple interlaced trigger sequences can be managed according to decisions made by ALICE’s Central Trigger Processor (CTP). Having concentrated and shaped enquired data from five TMUs to match the requested DDL format, each SMU forwards to the data acquisition system using a dedicated optical link.
This presentation addresses the difficulties arising from the above mentioned requirements and focuses on the implementation of the SMU.