Characteristics of type I and type III ELM precursors in ASDEX Upgrade

被引：51
|
作者：
Kass, T
Günter, S
Maraschek, M
Suttrop, W
Zohm, H
机构：
[1] Max Planck Inst Plasma Phys, EURATOM Assoc, D-85748 Garching, Germany
[2] Univ Stuttgart, Inst Plasmaforsch, D-7000 Stuttgart, Germany
来源：
NUCLEAR FUSION | 1998年 / 38卷 / 01期
关键词：
D O I：
10.1088/0029-5515/38/1/310
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 temporal evolution of the edge electron pressure gradient during the development of a type I ELM shows that proximity of del p(edge) to the ideal ballooning limit is not sufficient to trigger a type I ELM. Thus, the MHD structure of ELMs is investigated further. The present discussion focuses on the phenomenology of type I and type III ELM precursors. The ELM precursor types are well distinguished by their frequency behaviour and mode structure. The type I ELM precursor oscillation originates from a thin layer close to the plasma edge. For type III ELMs, on the contrary, del p(edge) has a much stronger influence as indicated by their occurrence during L mode.
引用
收藏
页码：111 / 116
页数：6
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