Magnetic shear: Difference between revisions

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Thus, in 3 dimensions, the shear is a 3 x 3 tensor.
Thus, in 3 dimensions, the shear is a 3 x 3 tensor.


In the context of magnetic confinement, and assuming the existence of toroidally nested magnetic flux surfaces (cf. [[MHD equilibrium]]), the only relevant variation of the direction of the magnetic field is the radial gradient of the rotational transform (field line pitch). The latter is defined as
In the context of magnetic confinement, and assuming the existence of toroidally nested magnetic [[Flux surface|flux surfaces]], the only relevant variation of the direction of the magnetic field is the radial gradient of the rotational transform (field line pitch). The latter is defined as


:<math>\frac{\iota}{2 \pi} = \frac{d \psi}{d \phi}</math>
:<math>\frac{\iota}{2 \pi} = \frac{d \psi}{d \phi}</math>

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