A three dimensionally position sensitive large area detector |
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Authors: | J Pochodzalla R Butsch B Heck G Hlawatsch A Miczaika HJ Rabe G Rosner |
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Affiliation: | Max-Planck-Institut für Kernphysik, D-6900 Heidelberg, Fed. Rep. Germany |
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Abstract: | A large area detector consisting of a parallel plate avalanche counter (PPAC) and a trapezohedral ionization chamber (TIC) is described. Its active area is 184 cm2. The time resolution of the PPAC is 175 ps. The energy resolution of the TIC is 0.4%, the energy loss resolution 2.8%, the nuclear charge resolution 2.3%. The TIC is position sensitive in three dimensions. The position x is measured via a saw-tooth anode with a resolution of 0.7 mm; the drift time coordinate shows a resolution of δy ? mm. The range z is determined by a new technique, a graded density Frisch grid. It enlarges the dynamic range of the charge measurement down to the Bragg maximum at E/A ~ 1 MeV. The resolution is δZ/Z ? 3.5% |
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