1. TRINITI Troitsk, Moscow reg. 142190 Russia
2. Ioffe Physico-Technical Institute, 26 Polytekhnicheskaja, St.Petersburg, 194021 Russia
3. Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, 10587 Berlin, Germany
4. National Institute for Fusion Science, Toki, 509-5292, Japan