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The bootstrap current in small rotating magnetic islands
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Bergmann, A., Poli, E. and Peeters, A. G. (2009) The bootstrap current in small rotating magnetic islands. Physics of Plasmas, Vol.16 (No.9). Article: 092507. doi:10.1063/1.3234252 ISSN 1070-664X.
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Official URL: http://dx.doi.org/10.1063/1.3234252
Abstract
The bootstrap current in small magnetic islands of neoclassical tearing modes is studied with guiding center particle simulations including pitch angle scattering. A model for a rotating island and its electric field is used and a new approximation to the electric potential in small islands is derived. Islands with sizes of the order of the ion banana orbit width are studied by means of a two-step model, which allows to treat both ions and electrons kinetically. The bootstrap current in such small islands is found to depend strongly on the direction of rotation of the island. The bootstrap current in small islands rotating in the ion diamagnetic direction is strongly diminished, similarly to what happens in big islands. In small islands rotating in the electron diamagnetic direction, on the contrary, the bootstrap current is almost completely preserved, implying a reduced neoclassical drive of the island growth. (C) 2009 American Institute of Physics. [doi:10.1063/1.3234252]
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Physics of Plasmas | ||||
| Publisher: | American Institute of Physics | ||||
| ISSN: | 1070-664X | ||||
| Official Date: | September 2009 | ||||
| Dates: |
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| Volume: | Vol.16 | ||||
| Number: | No.9 | ||||
| Number of Pages: | 9 | ||||
| Page Range: | Article: 092507 | ||||
| DOI: | 10.1063/1.3234252 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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