1. Institute of Thermomechanics, Academy of Sciences of the Czech Republic, Dolejškova 5, Praha 180 00, Czech Republic
2. Netme Centre, Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2896/2, 616 69 Brno, Czech Republic
3. Institute of Plasma Physics, Academy of Sciences of the Czech Republic, Za Slovankou 1782/3, 182 00 Prague, Czech Republic