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Assuming <math>B_\phi \gg B_\theta</math>, | Assuming <math>B_\phi \gg B_\theta</math>, | ||
one has <math>\sin(\alpha) \simeq \tan(\alpha)</math>, so that | one has <math>\sin(\alpha) \simeq \tan(\alpha)</math>, so that | ||
<ref>K. Miyamoto, ''Plasma Physics and Controlled Nuclear Fusion'', Springer-Verlag (2005) ISBN 3540242171</ref> | <ref>K. Miyamoto, ''Plasma Physics and Controlled Nuclear Fusion'', Springer-Verlag (2005) {{ISBN|3540242171}}</ref> | ||
:<math>L = 2 \pi r \frac{B_\phi}{B_\theta} = 2 \pi R q</math> | :<math>L = 2 \pi r \frac{B_\phi}{B_\theta} = 2 \pi R q</math> | ||