Darmstadt 2008 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Instrumentation und Anwendungen II

HK 47.2: Vortrag

Freitag, 14. März 2008, 14:15–14:30, 2D

The new Data Acquisition system of the HADES experiment. — •Marek Palka for the HADES collaboration — Jagiellonian University, Cracow, Poland — Gesellschaft für Schwerionenforschung, Darmstadt, Germany

The main goal of the HADES DAQ upgrade project is to achieve a primary data acquisition rate of 20 kHz also for events with maximum charged particle multiplicity (i.e Au+Au collisions). We favor a modular design to increase the scope of applications (e.g. to integrate new detector systems) and simplify the debugging. A first version (TRBv1) of a system fullfiling the above requirements was recently used during the production runs to read out four detector subsystems. However, in order to work at the highest rates and provide fast pre-processing for the different trigger levels, an improved board was necessary (TRBv2). Such a board has been built, featuring a fast optical link (2.5Gb/s), Tiger-Shark DSP (600 MHz), 2 Gb SDRAM and ETRAX-FS multiprocessor. In this talk, the real-world performance of this upgraded TRB will be presented. To this board customized Add-On boards are plugged providing the connectivity and functionality necessary to interface the different detector systems used in HADES. Following the same concept, an optical Hub with 16 transceivers (32 Gb/s) and the Central Trigger System have been implemented as Add-On boards. We will present the current status of all these different components and describe how they interact in a complete system.