1. Consorzio RFX (CNR, ENEA, INFN, Università di Padova, Acciaierie Venete SpA), Corso Stati Uniti 4, 35127 Padova, Italy
2. Department of Engineering Physics, University of Wisconsin–Madison, 1500 Engineering Drive, Madison, Wisconsin 53706, USA
3. Institut für Energieforschung-Plasmaphysik, Association EURATOM-FZJ, Jülich, Germany
4. General Atomics, P.O. Box 85608, San Diego, California 92121, USA
5. Plasma Physics Laboratory, Princeton University, P.O. Box 451, Princeton, New Jersey 08543, USA