Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 38: Instrumentation X
HK 38.7: Vortrag
Mittwoch, 16. März 2016, 15:45–16:00, S1/01 A2
The Crystal Zero Degree Detector for ISR tagging at BES III — Achim Denig1, •Leonard Koch2, Wolfgang Kühn2, Sören Lange2, Yutie Liang2, Christoph Redmer1, and Milan Wagner2 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 propose a small detector comprised of two arrays of scintillating crystals separated by a small gap to be placed in the very forward and backward region. The crystals will be read out by SiPMs and the signal will be digitized by a feature extracting flash ADC. This data stream is correlated with the BESIII trigger in realtime on FPGA based hardware.
The detectors response has been simulated using GEANT4 and the energy resolution has been obtained. A beam test of a prototype has demonstrated the stably running of the DAQ
This work is supported by grant DFG research group 2359.