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Jaeger, E.F.; Hedrick, C.L.; Spong, D.A.
Oak Ridge National Lab., TN (USA)1979
Oak Ridge National Lab., TN (USA)1979
AbstractAbstract
[en] One important area of disagreement between radial transport theory and the ELMO Bumpy Torus experiment (EBT) has been the degree of collisionality of the toroidal plasma electrons. Experiment shows relatively warm electrons (kT/sub e/ approx. 300 to 600 eV) and collisionless scaling, that is, energy confinement increasing with temperature. But results of early one-dimensional (1-D), neoclassical transport models with radially inward pointing electric fields are limited to relatively cool electrons (kT/sub e/ approx. 100 to 200 eV) and collisional scaling. In this paper these early results are extended to include lowest order effects of ion diffusion in regions where poloidal drift frequencies are small. Effects of direct, or nondiffusive, losses in such regions are neglected. Results show that solutions in the collisionless regime do exist. Furthermore, when effects of finite electron ring beta on magnetic fields near the plasma edge are included, these solutions occur at power levels consistent with experiment
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Apr 1979; 34 p; Available from NTIS., PC A03/MF A01
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Numerical Data
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