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Impact of Resonant Magnetic Perturbations on Zonal Modes, Drift-Wave Turbulence and the L-H Transition Threshold | | M. Leconte
; P.H. Diamond
; Y. Xu
; | | Date: |
4 Feb 2013 | | Abstract: | We study the effects of Resonant Magnetic Perturbations (RMPs) on turbulence,
flows and confinement in the framework of resistive drift-wave turbulence. This
work was motivated, in parts, by experiments reported at the IAEA 2010
conference [Y. Xu {it et al}, Nucl. Fusion extbf{51}, 062030] which showed a
decrease of long-range correlations during the application of RMPs. We derive
and apply a zero-dimensional predator-prey model coupling the Drift-Wave Zonal
Mode system [M. Leconte and P.H. Diamond, Phys. Plasmas extbf{19}, 055903] to
the evolution of mean quantities. This model has both density gradient drive
and RMP amplitude as control parameters and predicts a novel type of transport
bifurcation in the presence of RMPs. This model allows a description of the
full L-H transition evolution with RMPs, including the mean sheared flow
evolution. The key results are: i) The L-I and I-H power thresholds emph{both}
increase with RMP amplitude $|x|$, the relative increase of the L-I threshold
scales as $Delta P_{
m LI} propto |x|^2
u_*^{-2} gyro^{-2}$, where
$
u_*$ is edge collisionality and $gyro$ is the sound gyroradius. ii) RMPs
are predicted to emph{decrease} the hysteresis between the forward and
back-transition. iii) Taking into account the mean density evolution, the
density profile - sustained by the particle source - has an increased turbulent
diffusion compared with the reference case without RMPs which provides one
possible explanation for the emph{density pump-out} effect. | | Source: | arXiv, 1302.0611 | | Services: | Forum | Review | PDF | Favorites | |
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