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HK: Fachverband Physik der Hadronen und Kerne

HK 5: Instrumentation II

HK 5.3: Vortrag

Montag, 28. März 2022, 14:45–15:00, HK-H4

Characterization system for CsI crystals coupled to APDs — •Han-Bum Rhee, Anna-Lena Hartig, Noel Merkel, Christian Sürder, and Thorsten Kröll for the R3B collaboration — Institut für Kernphysik, TU Darmstadt, Germany

CALIFA @ R3B/FAIR is a highly granular detection system based on CsI(Tl) scintillation crystals with readout via avalanche photodiodes (APD). It aims to detect gamma rays and light charged particles. CALIFA consists of 2464 detection units and each detection unit has to be characterized. In order to automatize the characterization two system have been built.
The gain and the noise of the APDs depend on both temperature and bias voltage, hence both have to be controlled. The temperature of the system is controlled via a Peltier unit.
In CALIFA CsI crystals with several distinct trapezoidal shapes are used. This causes inhomogeneities in the crystal light output. These inhomogeneities were investigated by measuring the response of the detector-APD unit to a collimated source, which is placed close to the crystal but at different positions relative to the APD readout. For the placement of the source, a x-y scanning table with stepping motors was employed.
This work is supported by BMBF (05P19RDFN1, 05P21RDFN1) and the GSI-TU Darmstadt cooperation contract.