Studies of gas parameters and high-rate effects of an influence drift chamber

The test measurements at the Bonn Electron Synchrotron and at the Erlangen Tandem Accelerator have shown that with the asymmetric influence drift chamber with FADC readout a vertex detector is available, which combines a high position resolution of Δxθ=0=26 μm with a very good rate capability of 2.106 particles/m2.s, and low mass load. It could be shown that the position resolution at oblique tracks and FADC readout cannot be improved by the addition of ethanol to the chamber gas. A possibility for an improvement of the angle-dependent position resolution consists therefore in the application of FADC's with a higher tasting rate than 100 MHz. Because of the timely development it seems to be possible, to produce FADC's with a by 5 higher tasting rate. By this the deterioration of the resolution of oblique tracks may be limited to Δxθ/1deg=0.5 μm. As it was shown in the second part of this thesis, with the IDC even at rates of 3.106 particles/mm2.s still a position resolution in the range Δxθ=0=0.5 μm can be reached. Because of the self-stabilizing behaviour of the chamber it could be operated even at rates of 20.106 particles/mm2.s without perturbations. The asymmetric influence drift chamber fulfils by this all requirements, which are put on the experiment PS 185. By it furthermore an ideal vertex detector in other experiments of medium-energy physics is available. (orig.)