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The OPAL Barrel Presampler Detector |
The barrel presampler consists of 16 chambers covering the surface of a cylinder with radius 2.4 m and length 6.62 m. Each chamber is 3 cm thick and consists of two layers of limited streamer mode tubes with the wires running axially. On either side of the tubes are cathode strips, oriented at 45 degrees to the wire direction.
The following image shows the presampler during the construction of OPAL, after
it was mounted on the magnet coil.
OPAL calorimeters
The endcap time-of-flight detectors
The endcap presampler detectors