A three dimensionally position sensitive large area detector

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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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Present address: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.

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Present address: EG&G Instruments, D-8000 München 80, W. Germany.

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Present address: Physik-Department E18, Technische Universität München, D-8046 Garching, W. Germany.

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Present address: Hahn-Meitner-Institut, D-1000 Berlin 39, W. Germany.

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Present address: Gesellschaft für Schwerionenforschung, D-6100 Darmstadt, W. Germany.

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Present address: Physik-Department E12, Technische Universität München, D-8046 Garching, W. Germany.

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