**Acknowledgements**

The authors would like to thank Dr. Tomáš Hoder, Mr. Wolfgang Reich and Mr. Alexander Schwock for their support on this work.

The work is partly supported by the European Regional Development Fund, Baltic Sea Region programme 2007-2013 (project No 033, "Dissemination and Fostering of Plasma Based Technological Innovation for Environment Protection in The Baltic Sea Region", PlasTEP). The research leading to these results has received further funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement n°316216.
