Type II ELMy H modes on ASDEX Upgrade with good confinement at high density

被引：171

作者：

Stober, J ^{[1
]}

Maraschek, M ^{[1
]}

Conway, GD ^{[1
]}

Gruber, O ^{[1
]}

Herrmann, A ^{[1
]}

Sips, ACC ^{[1
]}

Treutterer, W ^{[1
]}

Zohm, H ^{[1
]}

机构：

[1] EURATOM, Max Planck Inst Plasmaphys, D-85748 Garching, Germany

来源：

NUCLEAR FUSION | 2001年 / 41卷 / 09期

关键词：

D O I：

10.1088/0029-5515/41/9/301

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：

H modes with good confinement and small ELMs with the characteristics of type II or grassy ELMs have been observed on ASDEX Upgrade. Such an ELM behaviour is essential to minimize erosion of the divertor tiles in any next step device. For the first time, operation with this favourable ELM type could be demonstrated close to the Greenwald density. Even for such high densities, energy confinement times were close to recent H mode scalings. High density even seems to be favourable, since steady state pure type II ELMy H mode phases on ASDEX Upgrade are obtained only above (n) over bar (e)/(n) over bar (GW) greater than or equal to 0.85. Additional requirements arc q(95) greater than or equal to 4.2 and an equilibrium close to a double null configuration with an average triangularity delta = 0.40. For these small ELMs magnetic precursors are observed with a frequency of approximate to 30 kHz and dominant mode numbers of toroidally 3 and 4 and poloidally greater than or equal to 14.

引用

页码：1123 / 1134

页数：12

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