Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Instrumentation XII

HK 52.4: Vortrag

Donnerstag, 13. März 2025, 16:30–16:45, SR Exp1B Chemie

Construction of the crystal Zero Degree Detector for BESIII — •Frederic Stieler, Achim Denig, Peter Drexler, Werner Lauth, Jan Muskalla, Saskia Plura, Christoph Florian Redmer, and Yasemin Schelhaas for the BESIII Germany collaboration — Institute for Nuclear Physics, Johannes Gutenberg University, Germany

The crystal Zero Degree Detector (cZDD) is a proposed addition to the BESIII experiment in China. In order to measure hadronic cross sections with the Initial State Radiation (ISR) method, for a more precise calculation of the hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon, ISR photons have to be detected. Since these photons are mostly emitted at small angles relative to the colliding particles, the cZDD will measure these photons at angles of about 1.5 mrad to 10.4 mrad, that are not covered yet by the already existing detectors at BESIII. Additionally, the cZDD will replace the Luminsoity monitors of BEPCII. Balancing both tasks of the cZDD is a challenge for the design of the readout.

This presentation discusses the design of the first prototype of the cZDD and the development of an online feature extraction based on FPGAs.

Keywords: BESIII; cZDD