Abstract
The linear gyrokinetic theory of the entropy mode is presented in a Z-pinch configuration in the regime of plasma β⪡1, focusing primarily on the parameter regime in which the ideal interchange mode is stable. The entropy mode is a small-scale, nonmagnetohydrodynamic mode that typically has peak growth rates at kρs∼1[ρs2=(T0e+T0i)∕(miΩci2)], with magnitudes comparable to those of ideal modes. The properties of this mode are studied as a function of the density and temperature gradients, plasma collisionality, and electron to ion temperature ratio.
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