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Conventional neoclassical theory in the Pfirsch-Schl\"{u}ter regime fails toaccurately model collision-induced transport in toroidal plasmas with highdensity gradients. In this scenario, we find that collision suppresses thereturn flow, leading to the dominance of the transport flux by the vacuumtoroidal field drift with a reduced Bohm-like scaling. The new regime is alsoconfirmed by full-orbit particle simulations, and can be employed to improvethe accurate modeling of impurity transport in toroidal magnetized plasmas.

Bohm-like Neoclassical Transport in Highly Collisional Toroidal Plasmas with High Density Gradients