APPLICATION OF THE MBWC 2-DIMENSIONAL POSITION READOUT TECHNIQUE TO AMULTIWIRE PROPORTIONAL COUNTER

A two-dimensional position readout technique named ''modified backgamm on method with weighted coupling capacitors (MBWC)'' has been applied to a multiwire proportional counter, and its image linearity and posit ion resolution have been investigated. One of two types of the techniq ue, the three-output MBWC method, has shown several kinds of image def ormations. The sources of the deformation and the way to avoid them ar e clarified. On the other hand, an essentially linear image has been r eadily obtained by adopting the other type (four-output MBWC method). The overall spatial resolution parallel to the wire direction and the spatial resolution of the position encoding cathode for the direction perpendicular to the wire have been investigated with Fe K X-rays. The best values obtained are 130 and 110 mu m (FWHM), respectively, which correspond to similar to 600 x 600 pixels.