Abstract
A matrix of nine lead-scintillator sandwich shower counters with wavelength shifter and photodiode readout was operated in an electron beam up to 6 GeV. The yield was measured to be 18500–25100 photoelectrons/GeV depending on the shape of the modules. An energy resolution of σ/√ E = 0.105 was observed, the contribution from diode and amplifier noise being 29 MeV. The position resolution was determined as σ ≈ 3.0 mm for 3 GeV electrons.
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