Vielzellenwiderstandsauslese für zweidimensionale Röntgenabbildungen : Optimierung der Abbildungseigenschaften bei Anwendungen mit schneller Bildfolge

The high photon fluxes provided by modern synchrotron radiation facilities have opened up new possibilities in the field of time resolved measurements e.g. for applications in fundamental research or technical applications. Concerning the photon detection the requirements of these experiments can not be satisfied by commercially available X-ray detectors. Besides a good time resolution combined with a good high rate behaviour the detector has also to provide a fair spatial resolution and a sensitive area as large as possible at given costs. This thesis describes detailed studies of a novel gaseous micro pattern single photon counter with position encoding by a truly two-dimensional interpolating readout of a resistive anode based on charge division. This concept provides a large reduction of the number of electronic channels compared to pure pixel devices. However, this readout design demands for sophisticated position reconstruction methods. To avoid spatial distortions and to optimise the position resolution different linear algorithms are combined. The influence of the reconstruction algorithm and of the charge diffusion at the anode structure on the dead time are estimated. In order to fully exploit the asynchronous and parallel readout capability, the locally confined charge information of the resistive structure is read out selectively by newly developed low dead time electronics. The prototype system provides a position resolution of 2 with only 64 electronic channels. The achievable time resolution is of the order of 100 ns. The rate capability amounts to > 2 · 105 photons cm −2 s −1 which can even reach 106 photons s −1 in spatially collimated photon spots.