Collisional transport in non-neutral plasmas

Several recent experiments have measured collisional transport in non-neutral plasmas (heat conduction, test particle diffusion, and viscosity) that is from 10 to 104 times larger than predicted by classical theory. New guiding center theories of collisional transport have been developed that agree with the measurements. The experiments operate in the guiding center regime rc≪λD, where rc is the cyclotron radius and λD is the Debye length. In this regime, classical transport theory is irrelevant because it implicitly assumes the opposite ordering, λD≪rc, although this ordering is not always satisfied in neutral plasmas.