Partial detachment of high power discharges in ASDEX Upgrade

被引：201

作者：

Kallenbach, A. ^{[1
]}

Bernert, M. ^{[1
]}

Beurskens, M. ^{[2
]}

Casali, L. ^{[1
]}

Dunne, M. ^{[1
]}

Eich, T. ^{[1
]}

Giannone, L. ^{[1
]}

Herrmann, A. ^{[1
]}

Maraschek, M. ^{[1
]}

Potzel, S. ^{[1
]}

Reimold, F. ^{[1
]}

Rohde, V. ^{[1
]}

Schweinzer, J. ^{[1
]}

Viezzer, E. ^{[1
]}

Wischmeier, M. ^{[1
]}

机构：

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

[2] Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England

来源：

NUCLEAR FUSION | 2015年 / 55卷 / 05期

基金：

欧盟地平线“2020”;

关键词：

power exhaust; detachment; ASDEX Upgrade; DIVERTOR; ITER;

D O I：

10.1088/0029-5515/55/5/053026

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：

Detachment of high power discharges is obtained in ASDEX Upgrade by simultaneous feedback control of core radiation and divertor radiation or thermoelectric currents by the injection of radiating impurities. So far 2/3 of the ITER normalized heat flux P-sep/R = 15 MW m(-1) has been obtained in ASDEX Upgrade under partially detached conditions with a peak target heat flux well below 10 MW m(-2). When the detachment is further pronounced towards lower peak heat flux at the target, substantial changes in edge localized mode (ELM) behaviour, density and radiation distribution occur. The time-averaged peak heat flux at both divertor targets can be reduced below 2 MW m(-2), which offers an attractive DEMO divertor scenario with potential for simpler and cheaper technical solutions. Generally, pronounced detachment leads to a pedestal and core density rise by about 20-40%, moderate (< 20%) confinement degradation and a reduction of ELM size. For AUG conditions, some operational challenges occur, like the density cut-off limit for X-2 electron cyclotron resonance heating, which is used for central tungsten control.

引用

页数：8

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