A new multiwire proportional chamber with fast single strip readout and individual analog to digital conversion
A new precision MWPC with an active length of 400 mm has been built for the Munich Q3D spectrograph. The readout method uses the individual amplitude signals of narrow cathode strips (3 mm width, 0.5 mm spacing). Each of these signals is converted into a digital word by an individual fast ADC. A newly developed hard wired logic calculates the position of the particle event by the center of gravity method with a dead time of about 108 μs. The position resolution in test measurements simulating particle events was better than 0.1 mm.