Nonlinear stabilization of tokamak microturbulence by fast ions

Journal article (2013)

Authors

J. Citrin CEA Cadarache, FOM Institute DIFFER - Dutch Institute for Fundamental Energy Research
F. Jenko Max Planck Institute
P. Mantica Associazione Euratom-ENEA-CNR
D. Told Max Planck Institute
C. Bourdelle CEA Cadarache
J.W. Haverkort Centrum Wiskunde & Informatica (CWI), FOM Institute DIFFER - Dutch Institute for Fundamental Energy Research
G. M.D. Hogeweij FOM Institute DIFFER - Dutch Institute for Fundamental Energy Research
T. Johnson KTH Royal Institute of Technology
M. J. Pueschel Pueschel University of Wisconsin-Madison
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Published Date

07-10-2013

Language

English

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Abstract

Nonlinear electromagnetic stabilization by suprathermal pressure gradients found in specific regimes is shown to be a key factor in reducing tokamak microturbulence, augmenting significantly the thermal pressure electromagnetic stabilization. Based on nonlinear gyrokinetic simulations investigating a set of ion heat transport experiments on the JET tokamak, described by Mantica et al., this result explains the experimentally observed ion heat flux and stiffness reduction. These findings are expected to improve the extrapolation of advanced tokamak scenarios to reactor relevant regimes.