[1] UNIV TORONTO, INST AEROSP STUDIES, TORONTO M3H 5T6, ONTARIO, CANADA
[2] AEA FUS, CULHAM LAB, ABINGDON OX14 3DB, OXON, ENGLAND
[3] UNIV LONDON ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, EGHAM, ENGLAND
[4] ECOLE POLYTECH FED LAUSANNE, CRPP, CH-1007 LAUSANNE, SWITZERLAND
[5] FORSCHUNGSZENTRUM JULICH, IPP, W-5170 JULICH 1, GERMANY