Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 21: Instrumentation VIII

HK 21.1: Group Report

Tuesday, February 27, 2018, 14:00–14:30, HZO 90

Status of the Barrel and Disc DIRC detectors at PANDA — •Markus Pfaffinger for the PANDA collaboration — Physikalisches Institut , Universität Erlangen-Nürnberg

The PANDA experiment at the new FAIR facility at GSI in Darmstadt will investigate open questions of hadron physics in the momentum region of 1.5−15  GeV/c with pp annihilations. The excellent particle identification (PID) needed will be achieved by two DIRC detectors. The Barrel DIRC will surround the interaction point and perform a π/K separation for momenta of 0.5−3.5  GeV/c at polar angles from 22^∘ to 140^∘. Its design is based on the successful BaBar DIRC with several improvements to make it more compact and to achieve a separation power larger than 3 σ for the expected momentum region of the π/K. In the forward region of the detector the Endcap Disc DIRC will be located to cover an angular region from 5^∘ to 22^∘ and clearly separate π/K up to 4  GeV/c with a separation power of about 3 σ. For the detection of the Cherenkov photons lifetime-enhanced MCP-PMTs will be used in combination with fast readout electronics. The radiators will be made of precisely polished fused silica to guarantee a low photon loss ratio and conserve the Cherenkov angle during their propagation through the optical components using internal total reflection. To evaluate the designs Geant4 simulations and tests of different prototypes have been performed at various beam facilities. This talk will present both detector concepts and the achieved results.