Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 8: Instrumentation II
HK 8.7: Vortrag
Montag, 14. März 2016, 15:45–16:00, S1/01 A3
An FPGA-based Sampling-ADC Readout for the Crystal Barrel Calorimeter — •Johannes Müllers1 and Pawel Marciniewski2 for the CBELSA/TAPS collaboration — 1Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany — 2Angströmlaboratoriet, Uppsala, Sweden
The CBELSA/TAPS experiment at the electron accelerator ELSA (Bonn) investigates the photoproduction of mesons off protons and neutrons. The Crystal Barrel Calorimeter has been upgraded replacing its photodiode readout by APDs, which allows the integration of the calorimeter into the first level trigger. Since the possible DAQ rate is currently limited by the digitization stage (LeCroy QDC1885F) to ≈2 kHz, the implementation of a new Sampling-ADC (SADC) readout is the second important step in the upgrade of the detector system.
Based on the 64-channel PANDA-SADC, the design was modified, adapting it to the needs of the CBELSA/TAPS experiment. The CB-SADC offers 64 channels in one NIM module with up to 14 bit@125 MHz, accompanied by a modular analog input stage and power supply. Data processing and reduction are realized with Kintex7 FPGAs. Readout is possible via gigabit ethernet links. Using an FPGA provides a multitude of possibilities for online feature extraction, such as the determination of the energy deposited in the crystal, TDC capabilities and pile-up detection and recovery. The SADC development will be discussed and first measurements performed in comparison to the presently used LeCroy QDC will be presented.
Supported by the Deutsche Forschungsgemeinschaft (SFB/TR16).