TJ-II:Transport and magnetic configuration: Difference between revisions
TJ-II:Transport and magnetic configuration (view source)
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* [[Magnetic well]] <ref>[http://dx.doi.org/10.1088/0741-3335/43/12A/324 C. Hidalgo et al, ''On the radial scale of fluctuations in the TJ-II stellarator'', Plasma Phys. Control. Fusion '''43''' (2001) A313-A321]</ref> <ref>[http://link.aip.org/link/?PHPAEN/9/713/1 J. Castellano et al, ''Magnetic well and instability thresholds in the TJ-II stellarator'', Phys. Plasmas '''9''' (2002) 713]</ref> <ref>[http://dx.doi.org/10.1088/0741-3335/44/12B/322 E. Ascasíbar et al, ''Confinement and stability on the TJ-II stellarator'', Plasma Phys. Control. Fusion '''44''' (2002) B307-B322]</ref> | * [[Magnetic well]] <ref>[http://dx.doi.org/10.1088/0741-3335/43/12A/324 C. Hidalgo et al, ''On the radial scale of fluctuations in the TJ-II stellarator'', Plasma Phys. Control. Fusion '''43''' (2001) A313-A321]</ref> <ref>[http://link.aip.org/link/?PHPAEN/9/713/1 J. Castellano et al, ''Magnetic well and instability thresholds in the TJ-II stellarator'', Phys. Plasmas '''9''' (2002) 713]</ref> <ref>[http://dx.doi.org/10.1088/0741-3335/44/12B/322 E. Ascasíbar et al, ''Confinement and stability on the TJ-II stellarator'', Plasma Phys. Control. Fusion '''44''' (2002) B307-B322]</ref> | ||
The picture emerging from these studies is complex. In general, the presence of low-order rational surfaces in the plasma does not seem to be deleterious for transport; rather, local reductions of transport are observed (except at very low shear). Possibly, this is associated with the formation of [[TJ-II:Internal Transport Barriers|internal transport barriers]] at or near such rational surfaces. On the other hand, the reduction of the magnetic well clearly enhances turbulence levels. | The picture emerging from these studies is complex. In general, the presence of low-order rational surfaces in the plasma does not seem to be deleterious for transport; rather, local reductions of transport are observed (except at very low shear). Possibly, this is associated with the formation of [[TJ-II:Internal Transport Barriers|internal transport barriers]] at or near such rational surfaces, a consequence of the modification of the radial electric field by the rational surfaces themselves. It is being investigated whether the plasmas where this has been studied have the conditions for a self-healing state of the corresponding magnetic perturbations. On the other hand, the reduction of the magnetic well clearly enhances turbulence levels. | ||
== References == | == References == | ||
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