Low pressure mucltiste avalanche chamber performance

A multistep low pressure avalanche chamber is described. The chamber operates using isobutane at a pressure of 6 torr. The area of the chamber is 240x180 mm. The detector has a high gas amplification coefficient of 3x106 at a nonuniformity of +-3% over the area. The space resolution for both coordinates is 170 μm (FWHM) for isotropic α-radiators placed in the immediate vicinity of a preamplifier gap of 0.5 mm. The good uniformity of the amplification coefficient, low noises and high stability make it possible to use such a coordinate detector in nuclear physics and for solving applied problems, e. g., in neutron radiography