Cylindrical multiwire proportional chambers for the PIBETA detector

The design and characteristics of two-coordinate cylindrical multiwire proportional chambers manufactured in JINR (Dubna) for experimental investigation of the π ⁺→π ⁰e ⁺ν _e decay are described. The chambers have diameters of 120 and 240 mm, lengths of 350 and 580 mm, respectively. The chambers are made as self-supporting constructions containing a small amount of matter in radial cross section. Information about the coordinates is obtained after processing the signals from anode wires and strips. The strips are placed on inner and outer cylinders at an angle to the wires. The results of the chamber test are given.