Formation of the high density front in the inner far SOL at ASDEX Upgrade and JET

被引：60
作者：
Potzel, S. [1 ]
Wischmeier, M. [1 ]
Bernert, M. [1 ]
Dux, R. [1 ]
Reimold, F. [1 ]
Scarabosio, A. [1 ]
Brezinsek, S. [2 ]
Clever, M. [2 ]
Huber, A. [2 ]
Meigs, A. [3 ]
Stamp, M. [3 ]
机构：
[1] Max Planck Inst Plasma Phys, D-85748 Garching, Germany
[2] Forschungszentrum Julich, Inst Energy & Climate Res, D-52425 Julich, Germany
[3] JET EFDA, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England
来源：
JOURNAL OF NUCLEAR MATERIALS | 2015年 / 463卷
关键词：
Density distributions - Heating power - High field sides - High-electron-density - Interferometric measurement - Private-flux regions - Scrape-off layer - Separatrix density;
D O I：
10.1016/j.jnucmat.2014.12.008
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This article presents the development of a region of high electron density, being one order of magnitude larger than the separatrix density, in the inner divertor of ASDEX Upgrade (AUG) and JET. The high-field side high density (HFSHD) occurs about 10 x lambda(q) away from the separatrix and about 20 cm above the X-point. To trigger the HFSHD, the inner divertor has to be detached while the outer one remains attached and the heating power has to be sufficiently high. The HFSHD, determined independently from spectroscopic and interferometric measurements, is clearly correlated with neutral fluxes in the far scrape-off layer; both increase with heating power. Injection of N-2 into the divertor private flux region suppresses the HFSHD in AUG and JET. The density distribution in the divertor with and without N-2 seeding is consistent with the total radiation and the D-lambda distribution. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：541 / 545
页数：5
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