desc.objectives.BScaleLength.compute

BScaleLength.compute(*args, **kwargs)[source]

Compute magnetic field scale length.

Parameters:

  • R_lmn (ndarray) – Spectral coefficients of R(rho,theta,zeta) – flux surface R coordinate (m).

  • Z_lmn (ndarray) – Spectral coefficients of Z(rho,theta,zeta) – flux surface Z coordinate (m).

  • L_lmn (ndarray) – Spectral coefficients of lambda(rho,theta,zeta) – poloidal stream function.

  • i_l (ndarray) – Spectral coefficients of iota(rho) – rotational transform profile.

  • c_l (ndarray) – Spectral coefficients of I(rho) – toroidal current profile.

  • Psi (float) – Total toroidal magnetic flux within the last closed flux surface (Wb).

Returns:

L (ndarray) – Magnetic field scale length at each point (m).