1. Max-Planck-Institut für Plasmaphysik, Boltzmannstrasse 2, D-85748 Garching, Germany
2. CCFE, Culham Science Centre, Abingdon, Oxon OX14 3DB, United Kingdom
3. Instituto de Plasmas e Fuso Nuclear, Instituto Superior Tcnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal
4. Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA