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HK: Fachverband Physik der Hadronen und Kerne

HK 59: Instrumentation XVI

HK 59.1: Gruppenbericht

Donnerstag, 17. März 2016, 16:30–17:00, S1/01 A3

The Barrel and Disc DIRC Counters for the PANDA Experiment at FAIR — •Mustafa Schmidt for the PANDA collaboration — II. Physikalisches Institut, Universität Gießen

The PANDA spectrometer for the future FAIR facility at GSI will be used to address open questions in hadronic physics by investigating antiproton collisions with a fixed target in the momentum range between 1.5 GeV/c and 15 GeV/c. In order to achieve a particle identification with a high precission, two different DIRC detector concepts have been developed by PANDA, which allow a compact detector design together with an excellent performance to cleanly separate pions, kaons, and protons. The Barrel DIRC in the target spectrometer of PANDA is based on the successful BaBar DIRC with several key improvements. It is designed for polar angles between θ=22^∘ and θ=140^∘ and momenta up to 3.5 GeV/c. The Disc DIRC is part of the endcap region of the spectrometer and covers the angular range from θ=5^∘/10^∘ to θ=22^∘ in the forward direction of PANDA. It will provide a π/K separation with a 4-σ seperation power up to a momentum of 4 GeV/c. Both Cherenkov detectors will use MCP-PMTs for the photon detection in combination with fast readout electronics. The radiators are synthetic fused silica plates with precision polished surfaces that guarantee to have very little photon losses by total reflection and conserve the Cherenkov angle during propagation through the optical system. Simulations with Geant4 and tests with several prototypes at various test beam facilities have been used to evaluate the designs and validate the expected PID performance of the DIRC counters.