TITLE

Transport properties of finite-β microturbulence

AUTHOR(S)
Pueschel, M. J.; Jenko, F.
PUB. DATE
June 2010
SOURCE
Physics of Plasmas;Jun2010, Vol. 17 Issue 6, p062307
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Via nonlinear gyrokinetic simulations, microturbulent transport is investigated for electromagnetic trapped electron mode (TEM) and ion temperature gradient (ITG) tokamak core turbulence with β up to and beyond the kinetic ballooning mode threshold. Deviations from linear expectations are explained by zonal flow activity in the TEM case. For the ITG scenario, β-induced changes are observed in the nonlinear critical gradient upshift—from a certain β, a strong increase is observed in the Dimits shift. Additionally, a Rechester–Rosenbluth-type model for magnetic transport is applied, and the amplitudes of magnetic field fluctuations are quantified for different types of turbulence.
ACCESSION #
51848445

 

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