Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 36: Instrumentation XII
HK 36.8: Talk
Wednesday, February 28, 2018, 15:45–16:00, HZO 90
Prototype Test Beam Results of the Crystal Zero Degree Detector for BES III — Achim Denig1, Peter Drexler1, Brice Garillon1, •Leonard Koch2, Wolfgang Kühn2, Sören Lange2, Werner Lauth1, Yutie Liang2, and Christoph Redmer1 for the BESIII collaboration — 1Johannes Gutenberg Universität Mainz — 2Justus-Liebig-Universität Gießen
The BES III experiment at the BEPCII electron positron collider in Beijing is collecting data in the charm-τ mass region. Being strongly peaked towards small polar angles, photons from initial state radiation (ISR) are detected with limited efficiency.
In order to increase the detection efficiency of these photons, we develop a small detector comprised of two arrays of scintillating crystals separated by a small gap to be placed in the very forward and backward regions. The scintillation light will be collected by silicon photomultipliers (SiPMs) and the signals will be digitized by feature extracting flash ADCs. This data stream is correlated with the BES III trigger in realtime on FPGA based hardware.
In November ’17, a prototype detector consisting of a single LYSO crystal, four SiPMs and the full readout chain was tested succesfully at the MAMI facility in Mainz.
This work is supported by grant DFG research group 2359.