1. Max-Planck-Institut für Plasmaphysik, Boltzmannstrasse 2, 85748 Garching, Germany
2. National Institutes for Quantum and Radiological Technology, Naka Fusion Institute, 801-1 Mukoyama, Naka-shi, Ibaraki-ken, Japan 311-0193
3. CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
4. CEA, IRFM, 13108 Saint-Paul-lez-Durance, France