München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 54: Poster
HK 54.67: Poster
Thursday, March 21, 2019, 16:30–19:00, Foyer Theresanium
Status of the LED based gain monitoring system for CALIFA CALorimeter for In flight detection of γ rays and high energy charged pArticles — •Christian Sürder, Anna-Lena Hartig, Alexander Ignatov, Thorsten Kröll, Noël Merkel, and Han-Bum Rhee for the R3B collaboration — Institut für Kernphysik, TU Darmstadt, Germany
CALIFA is part of the R3B setup of the future FAIR facility. The quality of the scintillator crystal is important for the setup perfomance. To check for the crystal’s light output uniformity a scanner was developed, using a collimated 137Cs source. The scanners features and future improvements will be presented. To be able to monitor changes of the crystal quality during experiments, a LED based gain monitoring system was developed. It produces a reliable signal to monitor the crystal quality over time. The peak position can be chosen via the light pulse intensity, produced by the LED. The LED system was attached to 64 CsI+APD detector units and was tested within the CALIFA demonstrator. The current development status and the further improvements will be presented. This work is supported by the German BMBF (05P15RDFN1 and 05P19RDFN1), GSI-TU Darmstadt cooperation contract and HIC for FAIR.