Abstract
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 rq−1 dq/dr=0.5 to 1.5, the trapped electron magnetic drift frequency can be approximated by ωdew (0.4 + 0.8rq−1dq/dr), where ωde is a constant, w is the particle kinetic energy, and q is the safety factor.
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