Position sensitive Multiwire Proportional Counter with delay-line readout

AbstraktAbstract

The MWPC has an active area of 40x38 mm^2. It is composed by three layers of 25 um gold wires. Each layer is at a distance of 2 mm from the next one and the wires are also placed at 2 mm distance. The innermost layer contains the anode wires where the charge is multiplied. The two outermost layers contain the cathode wires, where the ions from the charge avalanche are collected. These two layers are rotated by 90 degrees with respect to each other. The cathode wires in each dimension are interconnected by inductor and capacitor chains, allowing to determine the x and y coordinates of the position of the interaction from the time difference between the signals at each end of the delay lines. For the signal processing, the fast analog signals are discriminated and injected into CAMAC Time-to-Digital-Converter modules. A Labview software package was developed to reconstruct the images on-line. The position resolution for X-rays is 0.4 mm.

The MWPC has an active area of 40x38 mm^2. It is composed by three layers of 25 um gold wires. Each layer is at a distance of 2 mm from the next one and the wires are also placed at 2 mm distance. The innermost layer contains the anode wires where the charge is multiplied. The two outermost layers contain the cathode wires, where the ions from the charge avalanche are collected. These two layers are rotated by 90 degrees with respect to each other. The cathode wires in each dimension are interconnected by inductor and capacitor chains, allowing to determine the x and y coordinates of the position of the interaction from the time difference between the signals at each end of the delay lines. For the signal processing, the fast analog signals are discriminated and injected into CAMAC Time-to-Digital-Converter modules. A Labview software package was developed to reconstruct the images on-line. The position resolution for X-rays is 0.4 mm.