Description: The principle behind the Cherenkov Ring Imaging Detectors (CRIDs) involves focussing the Cherenkov light, emitted by a relativistic charged particle in passing through a radiator medium, onto a high efficiency photocathode which can be in turn read out with good spatial resolution, to localize the point of origin of the photoelectrons. This information permits the reconstruction of the circle of Cherenkov light for each particle above threshold, and hence the determination of the Cherenkov angle to an accuracy of a few percent. The groups currently working on these detectors are discussed, the status of these projects is examined, and progress is reported on the R and D on two 4-pi devices being prepared for physics at the Z. The activities are being done at Fermilab, CERN, and SLAC. 8 refs., 32 figs. (LEW)
Date: November 1, 1985
Creator: Leith, D.W.G.S.
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