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Detectors of Internally Reflected Cherenkov light (DIRC) are powerful devices for charged particle identification (PID). Indeed, the primary detector to separate kaons and pions up to few GeV/c in the barrel region of the BABAR experiment was based on the DIRC technology and performed extremely well over almost a decade of operation. In the first part of this talk, we will review the DIRC principles (charged particles emit Cherenkov light when crossing fused silica bars; part of the photons are trapped by total internal reflection and propagate in the radiators until a camera where they are detected by photon detectors) and the associated experimental challenges. We will focus on the BABAR ring-imaging Cherenkov detector, the DIRC. After presenting its design, we will summarize its performances such as the experience gained by operatin...
The Focusing Detector of Internally Reflected Cherenkov light (FDIRC) has been designed to separate efficiently kaons from pions up to a few GeV/c in the barrel region of a HEP experiment. This ring-imaging Cherenkov detector is based on the same principle as the BABAR DIRC, which was successfully operated at the SLAC PEP-II asymmetric B-Factory during a decade. Charged particles cross thin quartz bars in which they radiate Cherenkov light; part of these photons are trapped in the radiators by total internal reflection and propagate until a camera where they are detected by photon detectors. The FDIRC was intended for the SuperB detector, a new generation flavour factory which has been cancelled at the end of 2012 due to lack of funding. Therefore, it has been designed to be able to operate at very high luminosity (10^36/cm^2/s) and la...
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