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 10(4) 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 r(c) much less than lambda(D), where r(c) is the cyclotron radius and lambda(D) is the Debye length. In this regime, classical transport theory is irrelevant because it implicitly assumes the opposite ordering, lambda(D) much less than r(c), although this ordering is not always satisfied in neutral plasmas. (C) 1998 American Institute of Physics.