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The design of the pixel chamber is described, and the results of investigation of its characteristics are presented. The spatial resolution averaged over a cell of the pixel chamber is 0.9 mm at a beam intensity of up to 106 s−1 and becomes equal to 1.1 mm at an intensity of 5 × 106 s−1. The chamber efficiency is ∼90% at a beam intensity of 10−1 and decreases to 75% at 5 × 106 s−1.

The spatial nonuniformities of the response and the absolute light yield in calorimeter modules with interleaved absorber and scintillator layers were investigated on high-energy muon and electron beams. A program for detailed simulation of light collection in scintillator tiles of the calorimeter using the Monte Carlo method was developed to describe the whole set of experimental results. The experimental data are in good agreement with the results of simulation.