Light-matter interaction with highly charged ions

Within the APPA collaborative research center, the infrastructure and instrumentation for experiments on the light-matter interaction at the FAIR storage rings ESR/CRYRING/HESR and the trap HITRAP will be set and optimized, respectively. The experimental activities will be accompanied by theoretical studies. The experimental investigations comprise: a) the development of efficient x-ray optic for the energy range above 20 keV, which will be used for the x-ray spectroscopy of highly charged ions with calorimetric detectors. b) The optimization of the energy resolution of pixelated 2D/3D x-ray detectors for precision Compton-polarimetry. These detectors will mainly be used on the internal targets of the storage rings for the investigation of relativistic photon-matter interaction. c) The development and setup of a high power XUV-laser source for the spectroscopy of highly charged ions. On the theory side, predictions for the experimental detection of the pair creation via tunnel processes in the strong fields of highly charged ions and lasers will be made. Optimized detection schemes will be proposed.