Neoclassical transport in enhanced confinement toroidal plasmas

It has recently been reported that ion thermal transport levels in enhanced confinement tokamak plasmas have been observed to fall below the “irreducible minimum level” predicted by standard neoclassical theory. This apparent contradiction is resolved in the present analysis by relaxing the basic neoclassical assumption that the ion’s orbital excursions are much smaller than the local toroidal minor radius and the equilibrium scale lengths of the system.