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By P. Drexler, U. Thöring, W. Bonn, R. Holzmann, G. Van Der Kruk, B. Krusche, H. Löhner, V. Metag, T. W. Nijboer, J. G. Messchendorp, R. Novotny, A. Potapov, C. Salz, S. Schadm, M. Steinacher, M. Thiel and H. Vorenholt

Abstract

The new readout electronics for the electromagnetic calorimeter TAPS [1] has been developed by members of the TAPS collaboration at Gießen, KVI and Basel. The concept of the 4 channel readout module is a 4-fold integration of the BaF2 signal providing separate information of the long and short scintillation components in two different dynamic ranges. A CFD optimizes the time information obtained by a TAC and guarantees accurate integration gates necessary for pulseshape analysis. 2 LEDs allow first level trigger conditions. A PLD provides the slow control. The combined analog and digital functions are implemented on a piggyback residing on a commercial VME motherboard, developed by the HADES collaboration (CAEN V874). was obtained by irradiating each detector with the direct beam and by recording the energy loss of minimum ionizing cosmic muons in the individual detector modules. The absolute calibration is derived from GEANT3 simulations. Fig. 1 illustrates the overlay of measured line shapes for selected incident photon energies. The achieved energy Sigma(E)/E resolution of total light outpu

Year: 2011
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