Transition Radiation Detector (TRD)


DAQ coordinator:
Christoph Blume

blume(at) c.blume(at)


  • Electron-identification in the high momentum region (p > 1 GeV/c)
  • Identification of light nuclei via specific energy loss  
  • Tracking device, bridging the region between STS and TOF
  • Muon tracking station in the MUCH setup
                              TRD frontside



TRD backside


  • Pion suppression factor of 20 at 90% electron efficiency
  • Space point resolution of 300 μm
  • dE/dx resolution < 30%
  • Maximal signal collection time: 300 ns
  • Maximal hit rate < 100 kHz (min. bias Au+Au at 10A GeV)
  • Maximal cell occupancy < 10% (central Au+Au at 10A GeV)


  • Four detector layers (start version for SIS100)  
  • 54 modules per layer. 20 large types (99 x 99 cm2) and 34 small types (57 x 57 cm2)  
  • Fast MWPCs as readout chambers (12 mm gas thickness)  
  • Number of readout channels: 329728  
  • Active area of detector: 113.4 m2  
  • Material budget: < 5% X0  

Participating groups:  

  • Bucharest, Romania, National Institute of Physics and Nuclear Engineering (IFIN-HH)
  • Frankfurt am Main, Germany, Institut für Kernphysik (IKF), Goethe-Universitaet
  • Frankfurt am Main, Germany, Institut für Informatik, Infrastruktur und    Rechnersysteme in der Informationsverarbeitung (IRI), Goethe-Universitaet
  • Heidelberg, Germany, Institut für technische Informatik (ZITI), Ruprecht-Karls-Universitaet
  • Münster, Germany, Institut für Kernphysik (IKP), Westfälische Wilhelms-Universitaet