Kinetic estimate of the shielding of resonant magnetic field perturbations by the plasma in DIII-D

被引:95
作者
Heyn, Martin F. [1 ]
Ivanov, Ivan B. [1 ,2 ]
Kasilov, Sergei V. [1 ,3 ]
Kernbichler, Winfried [1 ]
Joseph, Ilon [4 ]
Moyer, Richard A. [4 ]
Runov, Alexey M. [5 ]
机构
[1] Graz Univ Technol, Assoc EURATOM OAW, Inst Theoret Phys Computat Phys, A-8010 Graz, Austria
[2] Petersburg Nucl Phys Inst, Gatchina 188300, Leningrad Reg, Russia
[3] Kharkov Phys & Technol Inst, Inst Plasma Phys, Ctr Nat Sci, UA-61108 Kharkov, Ukraine
[4] Univ Calif San Diego, La Jolla, CA 92093 USA
[5] EURATOM, Max Planck Inst Plasmaphys, Teilinst Greifswald, Greifswald, Germany
关键词
D O I
10.1088/0029-5515/48/2/024005
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
Effects of linear plasma response currents on non-axisymmetric magnetic field perturbations from the I-coil used for edge localized mode mitigation in DIII-D tokamak are analysed with the help of a kinetic plasma response model developed for cylindrical geometry. It is shown that these currents eliminate the ergodization of the magnetic field in the core plasma and reduce the size of the ergodic layer at the edge. A simple balance model is proposed which qualitatively reproduces the evolution of the plasma parameters in the pedestal region with the onset of the perturbation. It is suggested that the experimentally observed density pump-out effect in the long mean free path regime is the result of a combined action of ion orbit losses and magnetic field ergodization at the edge.
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页数:14
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