Benchmarking of collision operators with momentum source corrections

Maaßberg, H.; Beidler, C. D.
May 2010
Physics of Plasmas;May2010, Vol. 17 Issue 5, p052507
Academic Journal
Several linearized collision operator models with parallel momentum conservation enforced by source functions are benchmarked against the correct collision operator based on Rosenbluth potentials. The model operators without energy diffusion allow for an analytic solution of a generalized Spitzer problem. For the other operators under investigation, an integrodifferential equation is solved. The benchmarking is performed both for the parallel conductivity with the ions assumed at rest and for the bootstrap current, where ion and electron flows are collisionally coupled. The accuracy of the results obtained with the operators varies from rather poor in the case of the simplest monoenergetic model to quite satisfactory for the models employing an energy-weighted parallel momentum source function.


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