1. Department of Atomic, Molecular and Nuclear Physics, University of Seville, 41012 Seville, Spain
2. CNA (Universidad de Sevilla-CSIC-J. Andalucía), Seville, Spain
3. ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 Saint Paul-lez-Durance Cedex, France
4. CEA, IRFM, F-13108 Saint Paul Lez Durance, France
5. CCFE, Abingdon OX14 3DB, United Kingdom
6. Max-Planck-Institut für Plasmaphysik, Garching, Germany