b_sup_zeta

CurvCoords.b_sup_zetaSource

Toroidal contravariant basis \(\mathbf{b}^\zeta\).

\(\mathbf{b}^\zeta\) is defined as follows:

\[\mathbf{b}^\zeta = \frac{\mathbf{b}_\rho \times \mathbf{b}_\theta}{J}\]

where \(J\) is the Jacobian determinant of EMC3-EIRENE-defined center grids.

The shape array of \(\mathbf{b}^\zeta\) is (L, M, N, 3), which follows the order of (\(\rho, \theta, \zeta\)) grid resolution at the first three dimensions, and the last dimension is the coordinate of \((x, y, z)\).