Melt-layer ejection and material changes of three different tungsten materials under high heat-flux conditions in the tokamak edge plasma of TEXTOR

被引：37

作者：

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

Philipps, V. ^{[1
]}

Brezinsek, S. ^{[1
]}

Pintsuk, G. ^{[1
]}

Uytdenhouwen, I. ^{[2
]}

Wirtz, M. ^{[1
]}

Kreter, A. ^{[1
]}

Sugiyama, K. ^{[3
]}

Kurishita, H. ^{[4
]}

Torikai, Y. ^{[5
]}

Ueda, Y. ^{[6
]}

Samm, U. ^{[1
]}

机构：

[1] Forschungszentrum Julich, Inst Energy & Climate Res, EURATOM Assoc, D-52425 Julich, Germany

[2] EURATOM, CEN SCK, Belgian Nucl Res Ctr, Mol, Belgium

[3] Max Planck Inst Plasma Phys, EURATOM Assoc, Garching, Germany

[4] Toyama Univ, Hydrogen Isotope Res Ctr, Toyama, Japan

[5] Tohoku Univ, Int Res Ctr Nucl Mat Sci, Inst Mat Res, Oarai, Ibaraki 3111313, Japan

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

来源：

NUCLEAR FUSION | 2011年 / 51卷 / 11期

关键词：

D O I：

10.1088/0029-5515/51/11/113020

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：

The behaviour of tungsten (W) plasma-facing components (PFCs) has been investigated in the plasma edge of the TEXTOR tokamak to study melt-layer ejection, macroscopic tungsten erosion from the melt layer as well as the changes of material properties such as grain-size and abundance of voids or bubbles. The parallel heat flux at the radial position of the exposed tungsten tile in the plasma ranges around q(parallel to) similar to 45MWm(-2) causing samples to be exposed at an impact angle of 35 degrees to 20-30MW m(-2). Locally the temperature reached up to 6000 K, high levels of evaporation and boiling are causing significant erosion in the form of continuous fine spray or droplet ejection. The amount of fine-spray tungsten emission depends strongly on the material properties: in the case of the tungsten-tantalum alloy the effect of spraying and droplet emission is significantly higher at even low temperatures when compared with regular tungsten or even ultra-high purity tungsten which shows almost no spraying at all. Differences in the material composition, grain structure and size may be related to the different evolution of macroscopic erosion. In addition the re-solidified material is studied and strong differences in terms of re-crystallized grain size and evolution of the grain structure and grain orientation are observed. The build up of large voids has been observed.

引用

页数：8

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