Abstract
A gas detector system (GDS) consisting of a long ionisation chamber (LIC) and a parallel plate avalanche counter (PPAC) which is realized as a transmission detector in front of the LIC is described. The PPAC measures together with the rebuncher and the pulsing system of the Heidelberg MP tandem accelerator the time of flight, the LIC the energy E and the specific energy loss ΔE of the heavy ions. The LIC is characterised by its active depth of 80 cm, which results in an energy resolution of 0.4% for 150 MeV 32S ions. The energy resolution is limited by the energy loss straggling in the entrance windows. From measurements of heavy ion straggling in polypropylene foils a semi-empirical formula is derived. The time resolution of the system is 230 ps. The energy loss resolution is 3.6% for 150 MeV 32S ions. It is limited by the energy loss straggling in the gas. The active area is 20 cm 2. The coordinates of the incident ions can be measured to a precision of 1 mm.
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