Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Instrumentierung

HK 22.5: Talk

Tuesday, March 18, 2014, 15:00–15:15, HZ 9

A COME and KISS QDC read-out scheme for the HADES Electromagnetic Calorimeter — •Adrian Rost for the HADES collaboration — Technische Universität Darmstadt, Darmstadt

At the future FAIR Facility in Darmstadt the High Acceptance Di-Electron Spectrometer will continue its physics program. For beam energies between 2 and 40 GeV/u the database for pion and eta production is not complete. Therefore, interpretation of future di-electron data would have to depend on interpolations or on theoretical models. The addition of an electromagnetic calorimeter to HADES would allow such measurements and would additionally improve the electron-to-pion separation at large momentum p > 0.4 GeV/c. Furthermore, photon measurement would be of a large interest for the HADES strangeness program.

An 8 channel QDC Front-End-Electronics (FEE) was developed for the signals of photomultipliers (PMTs) from lead-glass calorimeter modules. The measurement principle is to convert the charge of the PMT signals into a pulse, where the charge is encoded in the width of the pulse. The width of the pulses is afterwards measured by the already well-established TRBv3 platform. For that simple electronics, hiding complex operations inside a commercial FPGA is used.

In this contribution the current status and future perspectives of this read-out concept will be shown.

Supported by VIP-QM/VH-NG-823, BMBF (05P12RFGHJ), Helmholtz Alliance EMMI, HIC for FAIR, HGS-HIRe.