1. Max-Planck-Institut fuer Plasmaphysik EURATOM-Association, Wendelsteinstr. 1, 17491 Greifswald, GER
2. Princeton Plasma Physics Laboratory, P.O. Box 451, Princeton, New Jersey
3. Colorado School of Mines, 1500 Illinois St., Golden, Colorado
4. EFDA-JET, Culham Science Centre, Abingdon, Oxfordshire, OX14 3DB, United Kingdom