München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 24: Instrumentation V
HK 24.3: Talk
Tuesday, March 19, 2019, 14:30–14:45, HS 11
The HADES electromagnetic calorimeter upgrade: commissioning with Ag beam* — •Adrian Rost for the HADES collaboration — TU Darmstadt
The HADES spectrometer is located at the SIS18 accelerator at the GSI Helmholtzzentrum für Schwerionenforschung GmbH in Darmstadt. The new electromagnetic calorimeter (ECAL) detector, which is based on lead-glass modules. For February and March 2019 a physics production beam time is planed. The calorimeter enables photon measurements. Thus neutral mesons (π0, η, ω), which are essential for interpretation of dilepton data, will be measured. Furthermore, photon measurement is of a large interest for the HADES strangeness program. The read-out system is based on the PaDiWa-AMPS2 Q2ToT (Charge-to-Time-over-Threshold) front-end board for the well established TRB3 (Trigger and Read-out Board - version 3) platform. The needed discriminators, the high precision TDCs (Time-to-Digital-Converters) and the data acquisition functionality are implemented with the help of FPGAs (Field Programmable Gate Arrays). In this contribution the performance of the detector under beam conditions will be shown. Special emphasis will be put on the read-out system and its performance.
*This work has been supported by the DFG through GRK 2128 and VH-NG-823.