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HK: Physik der Hadronen und Kerne

HK 48: Instrumentation and Applications VI

HK 48.6: Vortrag

Donnerstag, 14. März 2002, 17:30–17:45, F

Large-Area Glass Resistive Plate Chambers (GRPC) as Fast Timing Detector — •Zbigniew Tyminski — Gesellschaft für Schwerionenforschung, Darmstadt, Germany

In the framework of the FOPI upgrade project our collaboration is planning to build another time-of-flight detector shell capable of coping with the expected multiplicity of 80-100 charged particles (central Au+Au collisions at 1.5A GeV) at time resolutions below 100 ps. A possible solution are Glass Resistive Plate Chambers [1]. We have studied several prototypes of such detectors (400 cm² big) with 4 gaps of 300µm between glass plates of 0.5-2 mm thickness and intermediate strip electrodes formed of 12 or 16 parallel strips (pitch ≈3mm) which are read out on each side. The time is obtained by mean timing of the 2 signals, their difference delivers the position along the strip; charge averaging over neighbouring strips yields the perpendicular position. We describe details of the prototypes as well as tests in which we have obtained σ≈ 70 ps at efficiencies above 95%.

[1] P.Fonte et al., NIM A449(2000)295