1. Budker Institute of Nuclear Physics, 630090, Novosibirsk, Russia, V.I.Davydenko@inp.nsk.su
2. Novosibirsk State University, 630090, Novosibirsk, Russia
3. University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
4. Trilateral Euregio Cluster, Institut fuer Energieforschung-Plasmaphysik, Forschungszentrum Juelich GmbH, Association EURATOM-FZJ, 52425 Juelich, Germany