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1.3 General form of axisymmetric magnetic field

Combining Eqs. (8) and (9), we can write a general axisymmetric magnetic field as

B = Bp + B ϕ = ∇ Ψ × ∇ϕ + g∇ϕ. (10)
Expression (10) is a famous formula in tokamak physics.

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