Publications (8)5.75 Total impact
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Article: The upgraded HADES trigger and data acquisition system
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ABSTRACT: The HADES experiment is a High Acceptance Di-Electron Spectrometer located at GSI in Darmstadt, Germany. Recently, its trigger and data acquisition system was upgraded. The main goal was to substantially increase the event rate capability by a factor of up to 20 to reach 100 kHz in light and 20 kHz in heavy ion reaction systems. The total data rate written to storage is about 400 MByte/s in peak.In this context, the complete read-out system was exchanged to FPGA-based platforms using optical communication. For data transport a general-purpose real-time network protocol was developed to meet the strong requirements of the system. In particular, trigger information has to reach all front-end modules with latencies of less than 5 μs through up to 10 intermediate hubs in a star-like network setup. Monitoring and slow control features as well as readout and trigger distribution were joined in a single network protocol made up by three virtual channels with inherent arbitration by priority and a typical switching time of 100 ns. The full DAQ system includes about 550 FPGAs distributed over the complete detector system. For control and monitoring a virtual address space spanning the whole network is provided. Data are merged by the network hubs into data streams and passed on to a server farm using an Ethernet infrastructure. Due to the electromagnetic noise environment, several transmission error detection and correction features were included.In collaboration with groups from experiments of the FAIR accelerator complex, further developments based on the versatile hardware and communication protocol are being pursued.Journal of Instrumentation 12/2011; 6(12):C12056. · 1.87 Impact Factor -
Article: A compact system for high precision time measurements ( < 14 ps RMS) and integrated data acquisition for a large number of channels
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ABSTRACT: A high precision ( < 14 ps RMS time resolution) and high channel density ( ~ 256 channels) Time to Digital Converter (TDC) module (realized in FPGAs) with integrated DAQ is presented. The data is transported over up to 8 Gigabit-Ethernet or optical links with up to 3 Gb/s. Slow-Control information is transported over the same links. It can be attached directly to the detector, which allows the elimination of long cables and crate systems. The full 256 channel TDCs are expected to use approximately 30 W electrical power. The module size is 20 cm by 23 cm. Power is provided by a galvanically isolated 48 V low noise power supply. AddOn-boards adapt to the special needs of the detector to be read out, e.g. containing Charge to Width (Q2W) FEE for PMT readout.Journal of Instrumentation 12/2011; 6(12):C12004. · 1.87 Impact Factor -
Article: Inclusive e+e− pair production in p+p and p+Nb collisions at Ekin = 3.5 GeV
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ABSTRACT: We report on recent data of e+e− pair emission in proton nucleus collisions at energies above the light vector meson production thresholds. Invariant mass distributions for the p+Nb system at Ekin = 3.5 GeV are compared to data from elementary p+p reactions at the same beam energy. We observe a constant π0/ω yield ratio for both systems but an excess in the mass region above the π0 mass. Furthermore we present here the normalization procedure that was applied to p+Nb collisions by measuring the production of negative pions in the HADES acceptance.Journal of Physics Conference Series 09/2011; 316(1):012007. -
Article: The HADES DAQ System: Trigger and Readout Board Network
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ABSTRACT: HADES is a di-electron spectrometer operating at GSI, Germany. Currently, the HADES data and trigger system is being upgraded. The main aim is to substantially increase the event rate capabilities by a factor of up to 20 to reach 100 kHz in light systems and 20 kHz in heavy ion reactions. The data rate will be about 400 MByte/s in peak. In this context, the complete readout system has been exchanged to use optical communication. In this contribution we present a general-purpose real-time network protocol that has been developed to meet the new requirements. These include strong timing constraints with latencies less than 5 μs for endpoint-to-endpoint communication through up to 10 intermediate hubs in a star-like network setup. In summary, this network connects over 500 FPGAs distributed over the whole HADES detector. Monitoring and slow control features as well as readout and trigger distribution were joined in a single network protocol. Hence, channel multiplexing with inherent arbitration by priority is implemented. Switching between channels takes less than 100 ns. For control and monitoring, a dedicated channel provides a data bus with a virtual address space spanning the whole network. The configuration is highly flexible and thus adaptable to different experimental setups and hardware.IEEE Transactions on Nuclear Science 09/2011; · 1.45 Impact Factor -
Article: Single and double pion production in np collisions at 1.25 GeV with HADES
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ABSTRACT: The preliminary results on charged pion production in np collisions at an incident beam energy of 1.25 GeV measured with HADES are presented. The np reactions were isolated in dp collisions at 1.25 GeV/u using the Forward Wall hodoscope, which allowed to register spectator protons. The results for np -> pppi-, np -> nppi+pi- and np -> dpi+pi- channels are compared with OPE calculations. A reasonable agreement between experimental results and the predictions of the OPE+OBE model is observed.02/2011; -
Article: Cross section in deuteron-proton elastic scattering at 1.25 GeV/u
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ABSTRACT: First results of the differential cross section in dp elastic scattering at 1.25 GeV/u measured with the HADES over a large angular range are reported. The obtained data corresponds to large transverse momenta, where a high sensitivity to the two-nucleon and three-nucleon short-range correlations is expected.02/2011; -
Conference Proceeding: The HADES trigger and readout board network (TrbNet)
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ABSTRACT: HADES is a running hadron and di-electron spectrometer installed at GSI, Germany. Currently, the HADES data and trigger system is being upgraded. The main aim is an increase in the event rate capabilities by a factor of up to 20 to reach 100 kHz in light systems and 20 kHz in heavy ion reactions. The datarate will be in the order of 400 MByte/s in peak. In this context, the complete readout system has been exchanged to use optical communication. In this contribution we present a general-purpose real-time network protocol that has been developed based on our requirements. These include strong timing constraints with latencies less than 5 μs for endpoint-to-endpoint communication including up to 10 intermediate hubs in a star-like network setup. In HADES, this network connects over 500 FPGAs distributed over the whole detector. Monitoring and slow control features as well as readout and trigger transportation were joined in a single network protocol. Hence, channel multiplexing with inherent arbitration by priority is implemented. Typically, switching from one channel to another takes less than 100 ns. For slow control and monitoring, a dedicated channel provides a data bus with a virtual address space spanning the whole network. The configuration is highly flexible and thus adaptable to different experimental setups and hardware. Therefore, the network can also be used in any other experiment of the upcoming FAIR facility.Real Time Conference (RT), 2010 17th IEEE-NPSS; 06/2010 -
Article: The HADES-at-FAIR project
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ABSTRACT: After the completion of the experimental program at SIS18 the HADES setup will migrate to FAIR, where it will deliver high-quality data for heavy-ion collisions in an unexplored energy range of up to 8 A GeV. In this contribution, we briefly present the physics case, relevant detector characteristics and discuss the recently completed upgrade of HADES.Physics of Atomic Nuclei 75(5):589-593. · 0.57 Impact Factor
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Institutions
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2011
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Jagiellonian University
Kraków, Lesser Poland Voivodeship, Poland
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