Tungsten melt layer motion and splashing on castellated tungsten surfaces at the tokamak TEXTOR

被引：57

作者：

Coenen, J. W. ^{[1
]}

Bazylev, B. ^{[3
]}

Brezinsek, S. ^{[1
]}

Philipps, V. ^{[1
]}

Hirai, T. ^{[2
]}

Kreter, A. ^{[1
]}

Linke, J. ^{[1
]}

Sergienko, G. ^{[1
]}

Pospieszczyk, A. ^{[1
]}

Tanabe, T. ^{[4
]}

Ueda, Y. ^{[5
]}

Samm, U. ^{[1
]}

机构：

[1] Forschungszentrum Julich, Inst Energy Res Plasma Phys, EURATOM Assoc, D-52425 Julich, Germany

[2] ITER Org, F-13108 St Paul Les Durance, France

[3] Forschungszentrum Karlsruhe, Inst Hochleistungsimpuls & Mikrowellentech, Assoc Euratom FZK, D-76021 Karlsruhe, Germany

[4] Kyushu Univ, Interdisciplinary Grad Sch Engn Sci, Higashi Ku, Fukuoka 8128581, Japan

[5] Osaka Univ, Grad Sch Engn, Osaka 5650871, Japan

来源：

JOURNAL OF NUCLEAR MATERIALS | 2011年 / 415卷 / 01期

关键词：

HEAT LOADS; ITER; DIAGNOSTICS;

D O I：

10.1016/j.jnucmat.2010.09.046

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Dedicated melt experiments of castellated tungsten (W) surfaces under high heat-loads were carried out in TEXTOR. Several 2 mm thick tungsten plates were used in single and multiple exposure to steady state heat loads of similar to 20 MW/m(2) up to 70 MW/m(2). The evolution of the melt layer, its motion under tokamak conditions as well as melt ejection are shown. The motion is dominated by the Lorentz-force, driven via the thermionic emission current of the heated W-plate and the toroidal magnetic field while plasma pressure can be neglected under TEXTOR conditions. In theses experiments no significant material losses are observed (<100 mu g), while melt layer ejection in form of mm sized droplets is evident. The castellated structure can hinder the motion of thin melt while thick layers and multiple exposures lead to filling of gaps. Power-handling capabilities are significantly influenced by the changes in surface topology. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：S78 / S82

页数：5

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