Münster 2011 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 27: Instrumentierung VI
HK 27.2: Talk
Tuesday, March 22, 2011, 16:45–17:00, HS1
Optical Properties of Radiators for the PANDA Barrel DIRC — Roland Hohler1,2, •Grzegorz Kalicy1,2, Klaus Peters1,2, Georg Schepers1, Carsten Schwarz1, and Jochen Schwiening1 — 1GSI Hemholtzzentrum für Schwerionenforschung, Darmstadt — 2JWG Universität Frankfurt
The physics program of the PANDA experiment at the future FAIR facility includes hadron spectroscopy which requires efficient particle identification (PID) over a large angular and momentum range. The main system responsible for hadronic PID in the barrel region of the detector uses the DIRC (Detection of Internally Reflected Cherenkov light) principle with long, rectangular bars made from synthetical fused silica as radiators and light guides.
The performance of the Barrel DIRC strongly depends on the optical properties of radiators such as surface roughness. A motion controlled setup was designed for measurements of the bulk attenuation and reflection coefficient to qualify the production and polishing processes of the different bar manufacturers. This talk will present the results for several prototype bars from measurements using lasers with different wavelengths.
This research is supported by EU FP6 grant, contract number 515873 - DIRACsecondary-Beams