Vol.3, No 1, 2004 pp. 19 - 26
UDC 533.92
GENERATION OF THE SHEARED RADIAL ELECTRIC
FIELD BY A MAGNETIC ISLAND STRUCTURE
Ana Mančić1, Aleksandra Maluckov1,
Masayoshi Yokoyama2, Masao Okamoto2
1Faculty of Science and Mathematics,
P.O. Box 224, 18001 Niš, Serbia and Montenegro
2National Institute for Fusion Science,
Toki, Gifu, 509-5292 Japan
Abstract. The effect of the presence of a magnetic island structure
on the ambipolar radial electric field is studied in the context of the
belt island model. It is shown that the sheared radial electric field region
exists on the island position. Depending on the model parameters, the single
(ion root) or multiple (one ion and two electron roots) solutions for the
radial electric field are obtained at different radial positions. The radially
non-local treatment is developed proposing the steady-state plasma conditions.
The numerical calculations show that the diffusion of the radial electric
field is significant only near the island boundaries. As a result the discontinuities
in the ambipolar electric field profile are smoothed.
STVARANJE RADIJALNOG ELEKTRIČNOG POLJA
SA "SHEAR"-OM MAGNETNIM OSTRVIMA
Proučavan je uticaj prisustva magnetnih ostrva na ambipolarno radijalno
električno polje u kontekstu belt modela. Pokazano je da region "shear"
radijalnog električnog polja postoji na poziciji ostrva. U zavisnosti od
parametara, jednostruka ili višestruka rešenja su dobijena za radijalno
električno polje na različitim radijalnim pozicijama. Numerički proračuni
pokazuju da je difuzija radijalnog električnog polja značajna samo u blizini
granica ostrva. Kao rezultat, dolazi do poravnanja profila ambipolarnog
električnog polja.
