AbstractAbstract
[en] The non-adiabatic part of the electron distribution in toroidal geometry is investigated through numerical solution of the drift kinetic equation in various parameter regions. A Lorentz operator is used to model collisions for both trapped and untrapped electrons, thus including angle scattering for all of velocity space. Both poloidal and pitch angle dependence of the electron magnetic curvature and gradient drifts are included without the necessity of bounce averaging. No special boundary conditions are used at the trapped-untrapped electron boundary. A preconditioned conjugate gradient technique is used to solve the drift kinetic equation. The result is used in a dispersion relation which includes ion inertia and ion Landau damping to find growth rates for the dissipative trapped electron mode in the radially local case. Comparisons are made to results from simpler approximations such as the Krook model. The effects of magnetic curvature and gradient drifts are examined, as is the dependence of growth rates and distribution functions on collision frequency
Primary Subject
Source
1979; 93 p; University Microfilms Order No. 79-20,201; Thesis (Ph. D.).
Record Type
Report
Literature Type
Thesis/Dissertation
Country of publication
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Descriptors (DEC)
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