The monoenergetic approximation in stellarator neoclassical calculations

Details The monoenergetic approximation in stellarator neoclassical calculations The monoenergetic approximation in stellarator neoclassical calculations

2011-02-12

arxiv.org/abs/1102.2508v1

Physics

Plasma Physics

8 pages, 2 figures, submitted to Plasma Phys. Controlled Fusion

Scientific paper

In the standard "monoenergetic" approach to numerical calculation of stellarator neoclassical transport, to expedite computation, ad-hoc changes are made to the kinetic equation so speed enters only as a parameter. Here we examine the validity of this approach by considering the effective particle trajectories in a model magnetic field. We find monoenergetic codes systematically under-predict the true trapped particle fraction, with the error in the trapped ion fraction being of order unity when the electric field is large, suggesting some results of these codes may be unreliable in this regime. This inaccuracy is independent of any errors introduced by approximation of the collision operator.

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