Computational simulation reveals extreme heat flux runaway in ion temperature gradient turbulence, demonstrating that magnetic perturbations disrupt regulatory zonal flows.
A hitherto unexplained feature of electromagnetic simulations of ion temperature gradient turbulence is the apparent failure of the transport levels to saturate for certain parameters; this effect, termed here nonzonal transition, has been referred to as the high-β runaway. The resulting large heat fluxes are shown to be a consequence of reduced zonal flow activity, brought on by magnetic field perturbations shorting out flux surfaces.
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Pueschel et al. (2013) studied this question.
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