SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 74: Poster

HK 74.37: Poster

Donnerstag, 23. März 2023, 17:30–19:00, HSZ EG

Stability Tests for a Pulsed LED Gain Monitoring System for CALIFA — •Carl Georg Boos, Christian Sürder, and Thorsten Kröll for the R3B collaboration — Institut für Kernphysik, TU Darmstadt

The CALIFA array is part of the R3B set-up used for kinematically complete measurements of nuclear reactions. Those measurements are conducted at GSI and later FAIR, Darmstadt. The CALIFA is one of the core elements, functioning both as a calorimetre and a spectrometre for gamma-rays and light charged particles. It is built out of over 2000 CsI(Tl) crystals connected to APDs. As the gain is not constant for these detector systems - e. g. through possible ageing of the scintillation crystals and the temperature dependencies of the APDs - an Pulsed LED Gain Monitoring System is currently tested. The stability is examined to understand, to which extend the LEDs shift and to identify the reasons. Parameters investigated are pulse lengths and frequencies, the mimicing of the spill structure of the beam as well as the coupling of the fibres. In addition to lab test, a long measurement was started at the CALIFA array at GSI for possible correlations with temperature. This work was supported by BMBF 05P19RDFN1 and 05P21RDFN2.