Comparison of gyrokinetic stability code calculated critical ion temperature gradients and growth rates to DIII-D measured gradients and diffusivities

The gyrokinetic linear stability (GKS) code uses the gyrokinetic equations to calculate the characteristics of linear plasma turbulence in a shaped tokamak geometry. This code was used to solve for the critical ion temperature gradients and linear growth rates of ITG and TEM modes and compared these calculated quantities to measured ion temperature gradients and ion thermal diffusivities. The GKS results were generally consistent with the experimentally observed results in the sense that in regions of the plasma.