Poloidal mode ballooning of trapped electron instability

The effect of the magnetic moment dependence of the bounce averaged toroidal drift velocity on the eigenvalues and poloidal structure of the trapped electron mode is investigated in the radially local model. It is found that eigenvalues from the magnetic moment dependent dispersion relation deviate...

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Bibliographic Details
Published in:The Physics of fluids (1958) 1979-12, Vol.22 (12), p.2389-2393
Main Authors: Pandey, S. R., Ross, David W.
Format: Article
Language:English
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Summary:The effect of the magnetic moment dependence of the bounce averaged toroidal drift velocity on the eigenvalues and poloidal structure of the trapped electron mode is investigated in the radially local model. It is found that eigenvalues from the magnetic moment dependent dispersion relation deviate significantly from those of the constant drift velocity approximation for negative and large positive shear values. However, for shear ranging from r q −1 d q/d r=0.5 to 1.5, the trapped electron magnetic drift frequency can be approximated by ω d e w (0.4 + 0.8r q −1 d q/d r), where ω d e is a constant, w is the particle kinetic energy, and q is the safety factor.
ISSN:0031-9171
2163-4998
DOI:10.1063/1.862552