The occurrence and damage of unipolar arcing on fuzzy tungsten

被引：28

作者：

Aussems, D. U. B. ^{[1
]}

Nishijima, D. ^{[2
]}

Brandt, C. ^{[2
]}

van der Meiden, H. J. ^{[1
]}

Vilemova, M. ^{[3
]}

Matejicek, J. ^{[3
]}

De Temmerman, G. ^{[1
]}

Doerner, R. P. ^{[2
]}

Cardozo, N. J. Lopes ^{[4
]}

机构：

[1] FOM, Inst DIFFER, Dutch Inst Fundamental Energy Res, NL-3430 BE Nieuwegein, Netherlands

[2] Univ Calif San Diego, Energy Res Ctr, La Jolla, CA 92093 USA

[3] Assoc EURATOM IPP, Inst Plasma Phys, Prague 18200 8, Czech Republic

[4] Eindhoven Univ Technol, Sci & Technol Nucl Fus, NL-5600 MB Eindhoven, Netherlands

来源：

JOURNAL OF NUCLEAR MATERIALS | 2015年 / 463卷

关键词：

Magnetoplasma - Tokamak devices;

D O I：

10.1016/j.jnucmat.2014.09.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This research investigated whether unipolar arcing in the divertor of fusion reactors is a potential cause for enhanced wear of the divertor. It was found that 1 mu m of nano-fuzz growth is sufficient to initiate arcing, mainly depending on the sheath potential drop and electron density. The average mass loss rate induced by the arc was determined from mass loss measurements and found to be consistent with the value estimated from the arc current. The average arc track erosion depth was estimated by using the measured mass loss and damaged surface area and was found to be one tenth of the fuzzy layer thickness. Due to melting of the fuzzy structures the actual depth is larger and some arc tracks occasionally appeared to even reach the bulk beyond the fuzzy layer. The conclusion of this study is therefore that arcing in the divertor of future tokamaks (e.g. ITER) potentially is an important cause for surface damage and plasma pollution. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：303 / 307

页数：5

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