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

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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 > Physics
Journal or Publication Title:	Physics of Plasmas
Publisher:	American Institute of Physics
ISSN:	1070-664X
Official Date:	September 2009
Dates:	Date Event September 2009 Published
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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