Actions for Plasma transport coefficients for nonsymmetric toroidal confinement systems

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Plasma transport coefficients for nonsymmetric toroidal confinement systems

Author
Hirshman, S. P.
Published
United States : [publisher not identified], 1986
Springfield, Va.: National Technical Information Service, [approximately 1986]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Beasley, Jr., C. O., Crume, Jr., E. C., Shaing, K. C., and van Rij, W. I.

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Summary
A variational principle is developed for computing accurate values of local plasma transport coefficients in nonsymmetric toroidal confinement configurations. Numerical solutions of the linearized drift Fokker-Planck equation are used to obtain the thermodynamic fluxes as functions of collision frequenty and the radial electric field. Effects resulting from the variation of the longitudinal adiabatic invariant J along an orbit (due to particle transitions from helically trapped to toroidally trapped orbits) are treated. The velocity-space distribution resulting from trapped, circulating, and transition particle orbits is well represented by a Legendre polynomial expansion in the pitch angle coordinate. The computational effort is significantly reduced from that required with Monte Carlo methods through use of an efficient treatment of the disparity between the time scales of collisionless and collisional particle dynamics. Numerical computations for a stellarator configuration are presented. 24 refs. 9 figs.
Report Numbers
DE86007895; ORNL/TM-9925
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC05-84OR21400
OSTI Identifier 6092128
Research organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States).
View MARC record | catkey: 47363516