12 Magnetic coordinates (ψ,𝜃,ζ) with general toroidal angle ζ

  12.1 General toroidal angle ζ
  12.2 Contravariant form of magnetic field in (ψ,𝜃,ζ) coordinates
  12.3 Relation between the partial derivatives in (ψ,𝜃,ϕ) and (ψ,𝜃,ζ) coordinates
  12.4 Steps to construct a straight-line magnetic coordinate system
  12.5 Form of operator B ⋅∇ in (ψ,𝜃,ζ) coordinates
  12.6 Resonant surface of a perturbation
  12.7 Helical angle used in tearing mode theory
  12.8 Covariant form of magnetic field in (ψ,𝜃,ζ) coordinate system
  12.9 Form of operator (B ×∇ψ∕B2) ⋅∇ in (ψ,𝜃,ζ) coordinates
  12.10 Radial differential operator