Broadening of the power fall-off length in a high density, high confinement H-mode regime in ASDEX Upgrade

被引：72

作者：

Faitsch, M. ^{[1
]}

Eich, T. ^{[1
]}

Harrer, G. F. ^{[2
]}

Wolfrum, E. ^{[1
]}

Brida, D. ^{[1
]}

David, P. ^{[1
]}

Griener, M. ^{[1
]}

Stroth, U. ^{[1
,3
]}

机构：

[1] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany

[2] TU Wien, Inst Appl Phys, Fus OAW, Wiedner Hauptstr 8-10, A-1040 Vienna, Austria

[3] Tech Univ Munich, Phys Dept E28, D-85748 Garching, Germany

来源：

NUCLEAR MATERIALS AND ENERGY | 2021年 / 26卷

关键词：

Power exhaust; Scrape-off layer; Infrared thermography; WIDTH; SOL;

D O I：

10.1016/j.nme.2020.100890

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

The search for scenarios in which tolerable power exhaust is combined with good confinement must involve high separatrix densities. We present here the first infrared thermography measurements at ASDEX Upgrade in a high density, high confinement H-mode regime in which no type-I ELMs are present. This regime was formerly called type-II ELM or small ELM regime to distinguish it from type-I ELMs. We report on a broadening of the power fall-off length in this regime of up to a factor of four compared to low density inter type-I ELM conditions. This broadening is correlated to an increased filament detection rate as well as an increase in the pressure close to the separatrix. The broadening of the fall-off length decreases the peak heat flux, while the filaments lead to a quasi-continuous transport into the scrape-off layer and onto the divertor.

引用

页数：8

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