Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 62: Instrumentation XIII

HK 62.4: Vortrag

Freitag, 31. März 2017, 14:45–15:00, F 102

Detector performance tests for the CBM TRD — •Martin Kohn for the CBM collaboration — Institut für Kernphysik, WWU Münster

The Compressed Baryonic Matter (CBM) experiment is a fixed target heavy-ion experiment at the future FAIR accelerator facility. The CBM Transition Radiation Detector (TRD) is one of the key detectors to provide electron identification and charged particle tracking. For the detection of the Transition Radiation a Multi-Wire Proportional Chamber (MWPC) with a 5 mm drift region is used. With the construction phase of the detector nearing, we will present results of the detector obtained with the final detector prototypes. The outer dimensions of this chambers are 95×95 cm2. These results were achieved from data recorded at in-beam tests at CERN PS and SPS. The PS delivered a mixed pion/electron beam from 0.5 up to 3 GeV. From the SPS a Pb beam in the range from 13 AGeV to 150 AGeV was hit on a Pb target to archive environments with high interaction rate of charged particles. Particular focus was put on comparing the different prototypes from Frankfurt/Münster with rectangular readout pads on the one hand and the prototypes from Bucharest with triangular pads on the other hand. The TRD has different pad sizes for the MWPCs to handle different interaction rates depending on distance from the beam line. The large size prototypes has the largest pad size of 155×7.2 mm2. The Bucharest prototype has a pad-size of 7.5×25 mm2, which are split along the diagonal. For all measurements the same DAQ chain with SPADIC v1.0/1.1 front end electronic was used.

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