Bochum 2018 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 28: Instrumentation X
HK 28.2: Talk
Tuesday, February 27, 2018, 16:45–17:00, HZO 90
Prototype test for the PANDA Barrel DIRC — Ahmed Ali1,2, Anastasios Belias1, Roman Dzhygadlo1, Andreas Gerhardt1, Marvin Krebs1, Dorothe Lehmann1, 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) in the barrel region of the PANDA experiment at the new Facility for Antiproton and Ion Research in Europe (FAIR) at GSI, Darmstadt, will be provided by a DIRC (Detection of Internally Reflected Cherenkov light) counter. It will cover the polar angle range of 22-140 degrees and separate charged pions from kaons for momenta between 0.5 GeV/c and 3.5 GeV/c with a separation power of at least 3 standard deviations.
A sophisticated prototype was constructed and tested in a hadronic particle beam at CERN during the fall of 2017 to test the PID performance of the final design. The prototype comprised a narrow bar made from synthetic fused silica, a complex multi-layer spherical lens system, and a prism-shaped fused silica expansion volume. An array of microchannel-plate photomultiplier tubes was used to measure the location and arrival time of the Cherenkov photons. Data were collected for different optics configurations at different beam angles and momenta. Results of the analysis and a comparison to the Geant4 simulation will be presented.