Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Instrumentation

HK 19.1: Gruppenbericht

Dienstag, 20. März 2012, 16:30–17:00, P 3

The PANDA 3D Disc DIRC — •Benno Kröck, Michael Düren, Avetik Hayrapetyan, Klaus Föhl, Peter Koch, Oliver Merle, Daniel Mühlheim, and Julian Rieke — Justus-Liebig-Universität Gießen

A 3D Disc DIRC detector is foreseen to provide particle identification in the endcap region of the PANDA experiment at the future FAIR facility. The 3D-DIRC is a synthesis of the previously proposed FL-DIRC and TOP-DIRC at PANDA. It is based on the measurement of the internally reflected Cherenkov light in a 2 cm thick fused silica plate. Position sensitive single photon detectors—either MCP-PMTs or SiPMs—are placed in the focal plane of small focussing light guides and will provide a measurement of a projection of the Cherenkov angle. A precise determination of the time-of-propagation of the photons will allow to extract additional information of the Cherenkov angle and it will improve the identification of the signal pattern in a high luminosity, high background environment. Dichroic mirrors will be used to handle dispersion effects in the generation and propagation of the photons. The detector is expected to separate pions and kaons up to a momentum of ≈ 4 GeV/c. First Cherenkov patters were measured in 2011 using a glass prototype of the 3D disc DIRC.