A general survey is given of magnetic configurations with minimum B , possessing helical symmetry. An approximate analytical expression is derived for the volume per unit flux V '(Φ) in the neighbourhood of the helical magnetic axis. Exact formulae for V ' (Φ) and the mean rotational transform angle ι = 2πχ' (Φ) are expressed as single integrals. On the basis of numerical computation of these integrals, graphs of V ' (Φ) and χ'(Φ) up to the separatrix of the magnetic surfaces are constructed.
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Zueva et al. (1966) studied this question.
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