1. Assoc. EURATOM/ENEA/CREATE, Univ. Napoli Federico II, DIEL, Via Claudio 21, 80125 Napoli, Italy
2. Assoc. EURATOM/ENEA/CREATE, Univ. Basilicata, DIFA, Contr. Macchia Romana, 85100 Potenza, Italy
3. Assoc. EURATOM/ENEA/CREATE, DAEIMI, Univ. di Cassino, Via di Biasio 43, Cassino (FR), Italy
4. Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon, OX14 3DB, UK
5. See the Appendix of F. Romanelli et al., Fusion Energy Conference 2008 (Proc. 22nd Int. FEC Geneva, 2008) IAEA, (2008)