1. Aalto University, Department of Applied Physics, 02150 Espoo, Finland
2. CCFE, Culham Science Centre, Abingdon OX14 3DB, United Kingdom
3. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
4. Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, 1049-001 Lisboa, Portugal
5. Institut für Energie- und Klimaforschung – Plasmaphysik, Forschungszentrum Jülich, 52425 Jülich, Germany