Greenwald limit: Difference between revisions

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The Greenwald limit is an operational limit for the density in magnetic confinement devices:
The Greenwald limit is an operational limit for the density in magnetic confinement devices:
<ref>[http://dx.doi.org/10.1088/0741-3335/44/8/201 M. Greenwald, ''Density limits in toroidal plasmas'', Plasma Phys. Control. Fusion '''44''' (2002) R27-R53]</ref>
<ref>[[doi:10.1088/0741-3335/44/8/201|M. Greenwald, ''Density limits in toroidal plasmas'', Plasma Phys. Control. Fusion '''44''' (2002) R27-R53]]</ref>


:<math>n_G = \frac{I_p}{\pi a^2}</math>
:<math>n_G = \frac{I_p}{\pi a^2}</math>
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The mechanism behind this phenomenological limit is not understood, but probably associated with edge gradient limits.
The mechanism behind this phenomenological limit is not understood, but probably associated with edge gradient limits.
Recently, an explanation based on the formation of magnetic island was proposed. <ref>[[doi:10.1103/PhysRevLett.108.165004|D.A. Gates and L. Delgado-Aparicio, ''Origin of Tokamak Density Limit Scalings'', Phys. Rev. Lett. '''108''' (2012) 165004]]</ref>


== References ==
== References ==
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