Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 10: Instrumentation
HK 10.6: Vortrag
Montag, 4. März 2013, 12:15–12:30, WIL-A221
Performance of the HADES DAQ in Au+Au — •Jan Michel — Goethe-Universität, Frankfurt
The High Acceptance DiElectron Spectrometer (HADES) is located at the SIS-18 accelerator at the GSI Helmholtz Center for Heavy Ion Research in Darmstadt. In April 2012 a five-week experimental run using a 1.23 AGeV gold beam focused on a 15-fold segmented gold target was conducted.
One major reason for this successful data taking was the upgraded data acquisition system. An optical network running a customized network protocol (TrbNet) connects the frontend modules with read-out nodes. Here the data stream is converted to Gigabit Ethernet packets which are subsequently transported to a server farm using commodity hardware. All electronic components are supervised using a new, web-based monitoring system making use of the inherent slow-control features of TrbNet. In total, the system comprises of 550 FPGA-based modules, 30 Gigabit Ethernet links, four multi-core servers and 150 TB of local disk storage. The whole system is able to record event data in heavy-ion collissions at rates of up to 30 kHz and 800 MByte/s. During the experiment, the mean rates were 8 kHz and 150 MByte/s respectively mainly due to detector constraints. As a result, 7.7 · 109 events with a total volume of 140 TB were recorded throughout the run. In this contribution the set-up, performance figures and the slow-control concept will be shown.
*This work is supported by BMBF (06FY9100I and 06FY7114), HIC for FAIR, EMMI, GSI and HGS-Hire.