X-Y Multiwire Proportional Chamber (MWPC) with Delay Line Readout for the Magnet-Spectrograph of the "Julic" Cyclotron

A MWPC with an active area of 30 × 4 cm2 has been developed using two-dimensional delay-line readout. To avoid the problems associated with long wires, the anode and cathode wires are oriented at 45° to the X and Y axes; this is important for further extension in one direction. New electromagnetic delay lines for wire chamber readout with high bandwidth and low attenuation are used. The X-Y spatial resolution has been measured to be about 0,5 mm FWHM.