Sprecher
Beschreibung
This was the topic of my Master thesis.
I will discuss the limitations of the polarization purity in X-ray channelcut polarizers due to Umweganregungen. To reach polarization purities in the range of 10^(-12) or better, these Umweganregungen has to be avoided. This can be done by align the azimuthal angle of the crystal very precicely. I developed a new and faster method, based on the anomalous transmission of X-rays close to Laue-reflections (Borrmann effect), to do this. This method was tested at an X-ray tube in the lab as well as at the European XFEL. In will discuss the results and show that this method provides the possibility to align not only the azimuthal angle but also the tilt angle of the crystals. In priciple any crystal can be aligned with this method in all 3 space dimensions.
