= Ion-temperature-gradient instability
{title2=ITG}
= ITG instability
{c}
{synonym}
A drift-scale <plasma> instability fed by an <ion temperature gradient>. In common electrostatic limits, <Boltzmann electron response>, <ion> temperature evolution, magnetic drifts and <polarization drift> determine the dynamics. Unfavorable <magnetic field-line curvature> can drive a toroidal branch; straight-field branches can involve parallel compression. The threshold depends on the equilibrium gradients and geometry.
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