Sandra Eldrum¹, Christoph Terasa¹, Sebastian Boden¹, Lauri Panitzsch², Robert F Wimmer-Schweingruber¹, Stephan I Boettcher¹, Shrinivasrao R. Kulkarni¹, Robert Elftmann¹, Mahesh Yedla¹, Cesar Martin-Garcia³, Lars Seimetz¹, Ali Ravanbakhsh⁴, Javier Rodriguez-Pacheco⁵ and Manuel Prieto⁵, (1)University of Kiel, Institute for Experimental and Applied Physics, Kiel, Germany, (2)now at OHB Systems, Bremen, Germany, (3)now at Institute of Planetary Research, DLR, Berlin, Germany, (4)IEAP, University of Kiel, Kiel, Germany, (5)University of Alcala, Alcala de Henares, Spain