The P̄ANDA focussing-lightguide disc DIRC

Abstract

P̄ANDA will be a fixed target experiment internal to the HESR antiproton storage ring at the future FAIR complex. The P̄ANDA detector requires excellent particle-identification capabilities in order to achieve its scientific potential. Cherenkov counters employing the DIRC principle were chosen as PID detectors for the Target Spectrometer. The proposed Focussing-Lightguide Disc DIRC will cover the forward part of the Target Spectrometer acceptance in the angular range between 5° and 22°. Its design includes a novel approach to mitigate dispersion effects in the solid radiator of a DIRC counter using optical elements. The dispersion correction will enable the Focussing-Lightguide Disc DIRC to provide pion-kaon identification for momenta well above 3.5 GeV/c. © 2009 IOP Publishing Ltd and SISSA.