Reduction of neoclassical transport in the l/ν regime in torsatrons

A method of reducing the neoclassical transport coefficients in the l/ν regime in ℓ = 3 and ℓ = 2 torsatrons is presented. By appropriately modulating the pitch of the winding law of the helical conductors and applying an additional external transverse magnetic field, a reduction factor of two to four can be achieved.