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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 | 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> | ||