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Abstract

Molecular fragmentation processes can be observed very precisely with the help of dedicated detection systems. The MPIK in Heidelberg operates such a detector with the 3D imaging detector at the cryogenic storage ring CSR. Mainly reaction products from dissociative recombination of molecular ions with electrons are measured and observed here. In order to obtain reliable measurement results, the setting of the detector must be carefully adapted to the respective environment and circumstances of the experiment. For this purpose, the detector was examined in this work for the optimal configuration in the intended operating mode. In addition to these investigations, a new operating mode of the detector is implemented and investigated for its optimal parameters. This mode is to be introduced in order to raise the previous maximum count rate of 2×10³ s ⁻¹ without distorting the acquired data or fearing of possible damage to the detector. To achieve this, the detector is switched on and off periodically so that saturation effects are kept under control. Here two formulas were established, with which the settings for optimal measurement results in this mode can be achieved. At the same time, depending on the technical possibilities. The new operation mode at ∼ 10⁵s ⁻¹ was successfully demonstrated.