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(EXP3/20) Collisional Transport in Nonneutral Plasmas

   
D. H. E. Dubin 
 
Department of Physics, University of California, San Diego, La Jolla, California 92093-0319, USA

Abstract
Classical transport theory grossly underestimates collisionally-driven cross-field transport for plasmas in the parameter regime of $r_c \ll \lambda_D$, where $r_c \equiv \overline{v}/\Omega_c$, $\lambda_D^2 \equiv T/4\pi e^2 n$. In current experiments operating in this regime, cross-field test particle transport is observed to be a factor of 10 larger than the prediction of classical theory. Heat conduction is enhanced by up to 300 times over classical theory, and viscosity is up to $10^4$ times larger. New guiding center theories of transport due to long-range collisions have been developed that agree with the measurements. Theory also predicts that emission and absorption of plasma waves may further enhance the thermal conduction and viscosity, providing a possible mechanism for anomalous thermal conductivity in the electron channel of fusion plasmas.

 

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