High frequency edge coherent modes studied with the ultra-fast swept reflectometer on ASDEX Upgrade

被引:9
作者
Medvedeva, A. [1 ,2 ]
Bottereau, C. [1 ]
Clairet, F. [1 ]
Conway, G. D. [2 ]
Manz, P. [2 ]
Mink, F. [2 ]
Nikolaeva, V [5 ]
Prisiazhniuk, D. [2 ]
Stroth, U. [2 ,4 ]
Wolfrum, E. [2 ]
Biancalani, A. [2 ]
Heuraux, S. [3 ]
Molina, D. [1 ]
Silva, A. [5 ]
机构
[1] CEA, IRFM, F-13108 St Paul Les Durance, France
[2] Max Planck Inst Plasma Phys, D-85748 Garching, Germany
[3] Univ Lorraine, Inst Jean Lamour UMR 7198, CNRS, BP 50840, F-54011 Metz, France
[4] Tech Univ Munich, Phys Dept E28, D-8577 Garching, Germany
[5] Univ Lisbon, Inst Plasmas & Fusao Nucl, IST, Lisbon, Portugal
关键词
magnetic confinement; plasma physics; fusion; turbulence; L-H transition; coherent modes; H-MODE; PLASMAS; MHD;
D O I
10.1088/1361-6587/ab2575
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 results on high frequency coherent modes developing at the plasma edge after L-H transitions are presented. These edge coherent modes (ECMs) observed in the I-phase, during ELM-free and ELMy H-mode phases have common characteristics, such as their frequency of 50-200 kHz, radial position and scaling of the frequency with the pressure gradient. The ultrafast swept reflectometer with the sweep time of 1 mu s has provided measurements of the mode dynamics and localisation. The ECMs propagate in the electron diamagnetic direction in the laboratory frame and are localized in the region between the pedestal top and the steepest pressure gradient.
引用
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页数:10
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