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Rotational transform: Difference between revisions
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Assuming the existence of toroidally nested magnetic [[Flux surface|flux surfaces]], the rotational transform (field line pitch) is defined as | Assuming the existence of toroidally nested magnetic [[Flux surface|flux surfaces]], the rotational transform (field line pitch) is defined as | ||
<ref>[http://link.aps.org/doi/10.1103/RevModPhys.76.1071 A.H. Boozer, ''Physics of magnetically confined plasmas'', Rev. Mod. Phys. '''76''' (2004) 1071]</ref> | |||
:<math>\frac{\iota}{2 \pi} = \frac{d \psi}{d \phi}</math> | :<math>\frac{\iota}{2 \pi} = \frac{d \psi}{d \phi}</math> | ||