Abstract
The properties of a variety of different light guides used in conjunction with a large area scintillator (180 cm × 48.5 cm × 1 cm, SCSN-38) have been studied. The performance of a Y7 wavelength-shifter bar, a fishtail, a separated twisted and an all area coupled twisted lucite light guide were compared. The best performance was found for the all area coupled twisted guide. For this, we observed an average of 50 photoelectrons per minimum ionizing particale and a mean time resolution (σ) of 0.4 ns. for constant impact point of the particles. A Monte Carlo simulation of photon transmission in the counters has been done; the measured results on the performance of the various counter configurations agree well with the predictions of the simulation.
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