Magnetic well: Difference between revisions

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:<math>w(\bar r) = \frac{(dV(0)/d\Phi - dV(\bar r)/d\Phi)}{dV(0)/d\Phi }</math>
:<math>w(\bar r) = \frac{(dV(0)/d\Phi - dV(\bar r)/d\Phi)}{dV(0)/d\Phi }</math>


where <math>\bar r</math> is the average radius of a flux surface.
where <math>\bar r</math> is the [[Effective plasma radius|average radius of a flux surface]].
A positive gradient of ''w'' corresponds to a magnetic well (stable), and a negative gradient to a magnetic hill (unstable).
A positive gradient of ''w'' corresponds to a magnetic well (stable), and a negative gradient to a magnetic hill (unstable).


== References ==
== References ==
<references />
<references />

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