1. Fusion@ÖAW, Institute of Theoretical and Computational Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria
2. Institute of Plasma Physics, National Science Center “Kharkov Institute of Physics and Technology,” ul. Akademicheskaya 1, 61108 Kharkov, Ukraine
3. Max Planck Institute for Plasma Physics, Wendelsteinstr. 1, D-17491 Greifswald, Germany