Mainz 2012 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
HK: Fachverband Physik der Hadronen und Kerne
HK 53: Poster – Instrumentation
HK 53.28: Poster
Donnerstag, 22. März 2012, 14:00–16:00, P Foyer
Optical Properties of Radiators for the PANDA Barrel DIRC — Roland Hohler1,2, •Grzegorz Kalicy1,2, Dorothee Lehmann1, Klaus Peters1,2, Georg Schepers1, and Carsten Schwarz1 — 1GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt — 2Goethe-Universität, Frankfurt
PANDA is a next generation hadron physics detector under design for the Facility for Antiproton and Ion Research (FAIR) at Darmstadt, Germany. The main system responsible for charged particle identification in the barrel part of the detector will be the Cherenkov counter DIRC (Detector of Internally Reflected Cherenkov light).
The performance of the Barrel DIRC strongly depends on the surface quality and optical properties of long, rectangular bars made from synthetic fused silica, which are used as radiators and light guides to transmit the Cherenkov photons over long optical pathlengths with a large number of internal reflections.
A motion-controlled laser setup was built to check the optical properties of the DIRC bars. Results of the measurements of the bulk attenuation and reflection coefficient at multiple wavelengths will be presented for bars produced by several manufacturers using different polishing methods.
Work supported by EU6 grant, contract number 515873, DIRACsecondary-Beams, EU FP7 grant, contract number 227431, HadronPhysics2, and the Helmholtz Graduate School for Hadron and Ion Research HGS-HIRe.