Abstract
For fast identification of high-energy electrons and photons in heavy backgrounds, a counter was developed consisting of successive layers of lucite and lead. Čerenkov radiation emitted in the lucite slabs is collected onto the photocathode of one 5 inch phototube. The geometry as well as the thickness of inserted lead converters can be adapted to kinematical requirements. The properties of this counter have been checked at various energies. Typically, at 1 GeV/ c incoming momentum, proper discrimination setting will allow for the rejection of 99% of all π's and μ's, while only 1% of the electrons and photons will be lost. Rejection of protons is even more efficient. The response over the face of the counter is uniform. For a detailed study of this counter's properties, a lead glass Čerenkov counter and a lead-scintillator sandwich counter of comparable geometries were built. Results of quantitative comparison are given. A number of applications appear to favor this type of counter over others operating on more conventional principles.
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