b_sup_theta

CurvCoords.b_sup_thetaSource

Poloidal contravariant basis \(\mathbf{b}^\theta\).

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

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

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

The shape array of \(\mathbf{b}^\theta\) 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 \((x, y, z)\).