Frankfurt 2014 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 22: Instrumentierung
HK 22.6: Talk
Tuesday, March 18, 2014, 15:15–15:30, HZ 9
Temperature-dependent gain compensation of CsI(Tl) detectors using pulse shape analysis* — •Joel Silva1,2, Johann Isaak1,2, Bastian Löher1,2, Deniz Savran1,2, Matjaz Vencelj3, and Felix Wamers1,2 — 1ExtreMe Matter Institute EMMI and Research Division, GSI Helmholtzzentrum, Darmstadt, Germany — 2Frankfurt Institute for Advanced Studies FIAS, Frankfurt, Germany — 3Jožef Stefan Institute, Ljubljana, Slovenia
The scintillation properties of CsI(Tl) crystals and the gain of photo-sensors such as avalanche photodiodes (APDs) and photo-multipliers (PMs) are temperature dependent. Therefore, for accurate measurements in γ-ray spectroscopy using CsI(Tl) detectors temperature variations have to be precisely monitored. Since the decay time constants in the scintillation process of CsI(Tl) crystals also depend on the temperature, these changes can be compensated by analyzing the pulse shape of detector signals.
The method uses the correlation between the gain and the pulse-shape to correct the effect of the temperature. The results of the implementation of this method using CsI(Tl) crystals read out by PMs are presented. It shows to improve that the energy resolution of the detectors in a temperature changing environment ranging from -10 ∘C to 40 ∘C is improved. The suitability of the method using CsI(Tl) read out by APDs was investigated in the same temperature range. First results are also presented.
* Supported by the Alliance Program of the Helmholtz Association (HA216/EMMI)