In neoclassical transport theory the parallel viscosity causes the plasma pressure orthogonal to the magnetic field to depend on the poloidal and toroidal angles. If the Fourier components of the perpendicular pressure and the field strength are pMN and εMNB0, then one obtains strong shielding of a Fourier component of the field when |pMN|/|εMN|>B20/μ0. Estimates imply shielding becomes important in a stellarator for |εMN| smaller than a few tenths of a percent.
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Allen H. Boozer (1996) studied this question.
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