Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 44: Instrumentation IX
HK 44.5: Vortrag
Donnerstag, 30. März 2017, 15:15–15:30, F 102
The Technical Design of the PANDA Barrel DIRC — Ahmed Ali1,2, Anastasios Belias1, Roman Dzhygadlo1, Andreas Gerhardt1, Klaus Goetzen1, Marvin Krebs1,2, Dorothee Lehmann1, Frank Nerling1, Klaus Peters1,2, •Georg Schepers1, Carsten Schwarz1, and Jochen Schwiening1 for the PANDA collaboration — 1GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt — 2Goethe-Universität Frankfurt
Excellent hadronic Particle Identification (PID) is needed to meet the objectives of the rich physics program of the PANDA experiment at FAIR, which includes charmonium physics, exotics, hadron spectroscopy, nucleon structure, and hypernuclei. The Barrel DIRC (Detection of Internally Reflected Cherenkov light) of the PANDA Target Spectrometer will provide a π/K separation of better than 3 standard deviations for particle momenta up to 3.5 GeV/c and polar angles between 22∘ and 140∘. Several key aspects of the design, which was inspired by the successful BaBar DIRC, were improved. The Cherenkov photons produced in narrow radiator bars are focused by a three-component compound lens. The compact expansion volume consists of individual solid prisms made from synthetic fused silica. The photon patterns are detected by an array of lifetime-enhanced microchannel-plate photomultiplier tubes, which are read out by fast electronics with a time precision of about 100 ps. A second, cost-saving design uses wide radiator plates and a time-based reconstruction for the analysis of the resulting Cherenkov patterns. The two designs, and beam test results comparing their PID performance will be discussed.