Magnetic island: Difference between revisions

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In the context of magnetic confinement fusion, the basic magnetic field configuration consists of toroidally nested [[Flux surface|flux surfaces]], while each flux surface is characterised by a certain value of the [[Magnetic shear|rotational transform]] or safety factor ''q''. Magnetic islands can appear at flux surfaces with a rational value of the safety factor ''q = m/n''.
In the context of magnetic confinement fusion, the basic magnetic field configuration consists of toroidally nested [[Flux surface|flux surfaces]], while each flux surface is characterised by a certain value of the [[Magnetic shear|rotational transform]] or safety factor ''q''. Magnetic islands can appear at flux surfaces with a rational value of the safety factor ''q = m/n''.
<ref>[http://dx.doi.org/10.1051/anphys:2004001 J.H. Misguich, J.-D. Reuss, D. Constantinescu, G. Steinbrecher, M. Vlad, F. Spineanu, B. Weyssow, R. Balescu, ''Noble internal transport barriers and radial subdiffusion of toroidal magnetic lines'', Ann. Phys. Fr. ''28'' (2003) 1]</ref>
<ref>[http://dx.doi.org/10.1051/anphys:2004001 J.H. Misguich, J.-D. Reuss, D. Constantinescu, G. Steinbrecher, M. Vlad, F. Spineanu, B. Weyssow, R. Balescu, ''Noble internal transport barriers and radial subdiffusion of toroidal magnetic lines'', Ann. Phys. Fr. '''28''' (2003) 1]</ref>


== Birth ==
== Birth ==


The rupture of the original topology of toroidally nested flux surfaces needed to produce the island requires the reconnection of magnetic field lines, which can only occur with finite resistivity.
The rupture of the original topology of toroidally nested flux surfaces needed to produce the island requires the reconnection of magnetic field lines, which can only occur with finite resistivity.
<ref>[http://dx.doi.org/10.1088/0029-5515/49/10/104025 F.L. Waelbroeck, ''Theory and observations of magnetic islands'', Nucl. Fusion 49 (2009) 104025]</ref>
<ref>[http://dx.doi.org/10.1088/0029-5515/49/10/104025 F.L. Waelbroeck, ''Theory and observations of magnetic islands'', Nucl. Fusion '''49''' (2009) 104025]</ref>


== Transport effects ==
== Transport effects ==