High-accuracy, bidimensional read-out of proportional chambers with short resolution times

The pulses induced in a multiwire proportional chamber on orthogonal cathode strips are integrated after filtering through gates of variable widths, down to about 30 ns. The determination of the charge centroid gives two coordinates. With minimum ionizing particles the accuracy along the wires is better than 200 mu m (FWHM). The advantages of the method over other read-out methods or drift chambers are discussed. The pulse-height information may permit ambiguity removal for multiple tracks. (14 refs).