Global particle-in-cell simulations of plasma pressure effects on Alfvénic modes

Mishchenko, Alexey; Könies, Axel; Hatzky, Roman
January 2011
Physics of Plasmas;Jan2011, Vol. 18 Issue 1, p012504
Academic Journal
Global linear gyrokinetic particle-in-cell simulations of electromagnetic modes in realistic tokamak geometry are reported. The effect of plasma pressure on Alfvénic modes is studied. It is shown that the fast-particle pressure can considerably affect the shear Alfvén wave continuum structure and hence the toroidicity-induced gap in the continuum. It is also found that the energetic ions can substantially reduce the growth rate of the ballooning modes (and perhaps completely stabilize them in a certain parameter range). Ballooning modes are found to be the dominant instabilities if the bulk-plasma pressure gradient is large enough.


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