Type-I ELM substructure on the divertor target plates in ASDEX Upgrade

被引：102
|
作者：
Eich, T [1 ]
Herrmann, A [1 ]
Neuhauser, J [1 ]
Dux, R [1 ]
Fuchs, JC [1 ]
Günter, S [1 ]
Horton, LD [1 ]
Kallenbach, A [1 ]
Lang, PT [1 ]
Maggi, CF [1 ]
Maraschek, M [1 ]
Rohde, V [1 ]
Schneider, W [1 ]
机构：
[1] EURATOM, Max Planck Inst Plasmaphys, D-85748 Garching, Germany
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2005年 / 47卷 / 06期
关键词：
D O I：
10.1088/0741-3335/47/6/007
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：
In the ASDEX Upgrade tokamak, the power deposition structures on the divertor target plates during type-I edge localized modes (ELMs) have been investigated by infrared thermography. In addition to the axisymmetric strike line, several poloidally displaced stripes are resolved, identifying an ELM as a composite of several subevents. This pattern is interpreted as being a signature of the helical perturbations in the low field side edge during the non-linear ELM evolution. Based on this observation, the ELM related magnetic perturbation in the midplane can be derived from the target load pattern. In the start phase of an ELM collapse, average toroidal mode numbers around n approximate to 3-5 are found evolving to values of n approximate to 12-14 during the ELM power deposition maximum. Further information about the non-linear evolution of the ELM mode structure is obtained from statistical analyses of the spatial distribution, heat flux amplitudes and number of single stripes.
引用
收藏
页码：815 / 842
页数：28
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