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Title: Finite element solution of the Fokker-Planck equation in electrostatic magnetic mirror fusion machines

Journal Article · · Nucl. Sci. Eng.; (United States)
OSTI ID:6138400

A perturbation method is developed to find solutions of sloshing ion distributions. This method uses an expansion in the ratio of electrostatic potential to average ion energy to simplify the bounce-averaged Fokker-Planck equation. Finite element techniques, which provide rapid numerical solutions for parametric studies of sloshing ions, are used to derive the zeroth-order angular and velocity equations. The first-order two-dimensional equation was also expanded into finite element ''hat functions''. Application of Galerkin's method gives a linear system of equations where all matrix and source elements are calculated analytically. The density ratio and the potential profiles as functions of axial distance are computed. There is excellent agreement with results from the Lawrence Livermore National Laboratory bounce-averaged Fokker-Planck code with as much as 500 times and 50 times less Cray-1 computer time for the zeroth- and the first-order solutions, respectively.

Research Organization:
University of Illinois, Nuclear Engineering Program, Fusion Studies Laboratory, Urbana, IL 61801
OSTI ID:
6138400
Journal Information:
Nucl. Sci. Eng.; (United States), Vol. 92:1
Country of Publication:
United States
Language:
English