Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 41: Instrumentation 13
HK 41.4: Vortrag
Mittwoch, 25. März 2015, 15:30–15:45, M/HS1
FPGA-based calibration and monitoring system for the HADES Electromagnetic Calorimeter. — •Alessandra Lai for the HADES collaboration — University of Turin, Italy — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt
The High Acceptance Di-Electron Spectrometer (HADES) at GSI was designed to measure dileptons and strangeness in elementary and heavy-ion collisions. An upgrade of HADES with an Electromagnetic Calorimeter (ECAL) has started and will be ready for beam in 2017. The goal is to measure π0 and η meson yields together with the dielectron data in pion and proton-induced reactions as well as in heavy ion collisions. Moreover, photon measurement is important for Λ0 (1405) and Σ0 (1385) spectroscopy.
It is essential to precisely calibrate all the lead-glass crystal modules individually in order to achieve the required ECAL performances. Continuous monitoring with a light pulser system is required. It is foreseen to use blue light from an LED source, driven by short signals from a flexible pulse generator and distributed with optical fibers to each module of the ECAL. Due to their great flexibility, Field Programmable Gate Arrays (FPGA) have been chosen to implement the mentioned monitoring system. In this contribution an FPGA-based calibration system for commissioning as well as long term stability of the ECAL modules will be presented.
This work has been supported by BMBF (05P12RFGHJ), VH-NG-823, EMMI, GSI and HIC for FAIR.