Impact of rotating magnetic islands on density profile flattening and turbulent transport

被引:23
|
作者
Zarzoso, D. [1 ,2 ]
Hornsby, W. A. [2 ]
Poli, E. [2 ]
Casson, F. J. [3 ]
Peeters, A. G. [4 ]
Nasr, S. [1 ]
机构
[1] Aix Marseille Univ, CNRS, PIIM, UMR 7345, Marseille, France
[2] Max Planck Inst Plasma Phys, D-85748 Garching, Germany
[3] Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England
[4] Univ Bayreuth, Dept Phys, Theoret Phys 5, D-95447 Bayreuth, Germany
关键词
magnetic islands; turbulence; gyro-kinetic simulations; nuclear fusion; BOOTSTRAP CURRENT; TEARING MODES; TOKAMAK; PLASMAS; RECONNECTION; PINCH;
D O I
10.1088/0029-5515/55/11/113018
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The impact of rotating magnetic islands on background radial profiles in the presence of strong turbulent transport is analysed, with particular emphasis on island widths of the order of 6-10 ion Larmor radii. Only the case of ion temperature gradient (ITG) turbulence is considered. A significant reduction of fluctuations is found when island and turbulence co-rotate and the island width is of the order of the radial correlation length of turbulence. This reduction is not due to a flattening of ion temperature, suggesting an additional mechanism. A nonlinear transfer of energy from small to large scale structures might be responsible for the stabilization at a scale close to the radial correlation length of turbulence. It is shown that in the presence of intermediate magnetic islands rotating in the ion diamagnetic direction the density flattening survives the radial turbulent transport, representing a destabilizing effect for a magnetic island in terms of bootstrap current. However, this flattening is not necessarily due to an adiabatic response of trapped ions. Owing to the fast parallel motion of electrons, their temperature is always flattened. Finally, when the island width is large enough (island width greater than 18 ion Larmor radii), the standard profile flattening leading to a linear stabilization of turbulence dominates over the other mechanisms.
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页数:13
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