Abstract
The nonlinear “Dimits” upshift found in gyrokinetic Cyclone simulations has been recovered in simulations using a reactive fluid model. Its magnitude is in good agreement with the gyrokinetic simulations. The upshift is caused by resonant excitation of zonal flows which also provide an absorbing boundary for long wavelengths in the regime above the nonlinear upshift. In agreement with analytical predictions, magnetic shear has a destabilizing effect in combination with zonal flows.
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