Ion temperature gradient driven instability in high beta plasmas of a sheared slab

Songfen Liu; Wei Kong; Beilai Hu; Feng Liu; Jiaqi Dong; Zhe Gao
January 2009
Physics of Plasmas;Jan2009, Vol. 16 Issue 1, pN.PAG
Academic Journal
A set of simplified integral eigenmode equations with neglecting of the magnetic gradient drift effects are derived and employed to investigate the ion temperature gradient modes in plasmas of sheared slab geometry. Perturbations of both perpendicular and parallel components of magnetic vector potential are considered, as well as the perturbation of the electrostatic potential. The characteristics of the ion temperature gradient instability are studied with the equations and the corresponding computer code, and compared with those with the drift effects included. The results show that the magnetic gradient drift has a block effect on ion temperature gradient mode stabilization, and the perpendicular component of the perturbed magnetic vector potential has strong stabilizing effects on ion temperature gradient modes. Nevertheless, the results from the simplified equations are qualitatively in agreement with those from the complete equations and the differences between them are not significant quantitatively. The simplified equations have the advantages of saving computer time and being well suited to analytic methods.


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