Readout concepts for the suppression of the slow component of BaF2 for the upgrade of the TAPS spectrometer at ELSA

16th International Conference on Calorimetry in High Energy Physics

Diehl, Stefan^1 ; Novotny, Rainer W^1 ; Wohlfahrt, Benjamin^1 ; Beck, Reinhard^2

2nd Physics Institute University Giessen, Heinrich-Buff-Ring 16, Giessen

35392, Germany^1

Helmholtz-Institut für Strahlen, Kernsphysik University Bonn, Nussallee 14-16, Bonn

53115, Germany^2

关键词: Crossluminescence;    Energy resolutions;    Fast scintillator;    Inorganic scintillator;    Interaction rate;    Optical bandpass filters;    Orders of magnitude;    Rate capabilities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/587/1/012044/pdf
DOI  :  10.1088/1742-6596/587/1/012044

来源: IOP

【 摘 要 】

For the measurement at extremely high interaction rates with fast scintillators, pile-up of consecutive events is a limiting factor. With a decay time of 600 ps of the fast crossluminescence component, Barium Fluoride (BaF2) is one of the fastest inorganic scintillators known today. However, the dominating slow component with a 3 orders of magnitude longer decay time of 630 ns limits the rate capability. To circumvent this limit, different approaches have been made in the past. The slow component can be suppressed for example by doping the crystals with rare earth ions like La3+. The paper will give an overview over the various concepts investigated in the past and present the suppression via optical band pass filters. This method has been chosen for the upgrade of the BaF2crystals in the most forward region of the TAPS-spectrometer at ELSA in Bonn. It allows to reuse the existing crystals and to achieve a high degree of suppression of the slow component. The focus of the paper will be on the selection of the filters, the achievable rate capability and the energy resolution of the fast component.