Abstract
A position sensitive detector - for light particles - of about 150 cm length and a resolution of ∼ 0.5 mm is needed for the Munich Q3D spectrograph. For high resolution this detector must follow the curvature of the Q3D s focal surface. As a substitute for the MWPC of Glässel two new detectors, a short one (∼28 cm) and a long one (2 m) of the same type were constructed. The main features are: wire-spacing 0.5 mm, wire thickness 8 φm, particle detection from each position separately, total energy measurement in a subsequent plastic scintillator and thus ΔE/ E particle discrimination. The design of the detectors, the associated electronics and their performance in measurements since spring 1981 (short detector) and spring 1982 (long detector) respectively are reported.
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