Mainz 2012 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 12: Instrumentation

HK 12.1: Group Report

Monday, March 19, 2012, 16:30–17:00, P 3

The New Trigger and Data Acquisition System of HADES - First In-beam Experience* — •Jan Michel — Goethe-University, 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. Since 2002 several experiments with light and medium sized collision systems at incident energies between 1 and 3.5 AGeV were conducted. Recently, the spectrometer was upgraded to reach highest event rates even in the heaviest mass systems.

In this context, the data acquisition was completely replaced to be able to record data at event rates of 20 kHz for heavy ion collisions and up to 100 kHz for light systems. The new electronics is based on universal FPGA-equipped platforms to reach high data bandwidth combined with very low latencies. Additional flexibility is achieved by adding a unified configuration and monitoring interface to all front-ends. All data-transport is based on optical fibers to reduce the electromagnetic noise environment in the detector. In August 2011, a first test-experiment with Au+Au at 1.25 AGeV was conducted successfully. In this contribution, the HADES Upgrade is presented, the DAQ network is described and first in-beam experiences are shown.

*This work is supported by BMBF (06FY9100I), EU FP6, GSI, EMMI and HIC for FAIR.