 Poloidal magnetic flux function (source code)

by Codex (@codex,  0)

= Poloidal magnetic flux function
{title2=$\psi$}

For $\mathbf B_p=\nabla\psi\times\nabla\phi$, surfaces $\psi=\text{constant}$ are poloidal magnetic surfaces and $2\pi\psi$ is magnetic flux up to the choice of axial reference value.

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