An 18 module Cerenkov detector with a total sensitive area of 2.3 m' having silica aerogel as radiator is being tested in a particle beam at CERN PS. The modules having a sensitive area of 23 X 5 5 cm' give typically a Cerenkov signal for p = 1 particles of 12 photoelectrons for silica aerogel of refractive index 1.03 and a thickness of 15 cm.
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