L. Garcia et al 2003 Nucl. Fusion 43 553 doi:10.1088/0029-5515/43/7/307
L. Garcia1, B.A. Carreras2, V.E. Lynch2 and M. Wakatani3,a
Show affiliationsThe resistive pressure gradient driven instability model is used to study the effect of plasma on a vacuum magnetic field island. Conditions under which the magnetic island is amplified or reduced have been identified. Starting with a set of reference parameters, we have varied these parameters by increasing either the density or the electron temperature. These scans lead to very different results. When β increases because of the increase in density, so does the island width. However, in cases in which β is increased by increasing the electron temperature, we observe a decrease in the island width. The main mechanism for island reduction seems to be the generation of strong sheared flow associated with the magnetic island. These results seem to reflect some observations in the Large Helical Device.
52.55.Hc Stellarators, torsatrons, heliacs, bumpy tori, and other toroidal confinement devices
52.65.Kj Magnetohydrodynamic and fluid equation
52.35.-g Waves, oscillations, and instabilities in plasmas and intense beams
Issue 7 (July 2003)
Received 14 November 2002, accepted for publication 23 May 2003
Published 18 June 2003
L. Garcia et al 2003 Nucl. Fusion 43 553
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