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HK: Fachverband Physik der Hadronen und Kerne

HK 39: Instrumentation VIII

HK 39.1: Gruppenbericht

Mittwoch, 20. März 2019, 14:00–14:30, HS 11

The PANDA DIRC Detectors — •Ilknur Koseoglu for the PANDA collaboration — JLU Giessen, Giessen, Germany — GSI, Darmstadt, Germany

The PANDA experiment at the new Facility for Antiproton and Ion Research (FAIR) near Darmstadt/Germany is planned to investigate fundamental questions of hadron physics. The PANDA detector is designed as a fixed-target experiment by using antiproton beam with a momentum range of 1.5 to 15 GeV/c colliding on a hydrogen or nuclear target. In order to achieve excellent particle identification (PID), two DIRC detectors have been developed. The Barrel DIRC will cover the polar angles from 22°-140° and perform π/K separation with 3 σ or more for momenta from 0.5 to 3.5 GeV/c. The design of the Barrel DIRC is based on the successful BaBar DIRC and the SuperB FDIRC R&D with several improvements to optimize the performance for PANDA. The novel Endcap Disc DIRC (EDD) will cover the polar angle range from 5° to 22° and will provide π/K separation up to 4 GeV/c with a separation power of about 3 σ. Both PANDA DIRC use synthetic fused silica bars or plates as radiators and lightguides and lifetime-enhance Microchannel Plate PMTs (MCP-PMTs) as sensors. The Cherenkov radiator for the EDD is a 2 cm thin plate of synthetic fused silica, divided into 4 identical quadrants. In order to conserve the Cherenkov angle during propagation, the surfaces of the 4 quadrants are polished with high precision. The technical design of the two DIRC detectors and the results of beam tests at CERN for two prototypes will be presented.