Analysis of structural changes and high-heat-flux tests on pre-damaged tungsten from tokamak melt experiments

被引：17

作者：

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

Philipps, V. ^{[1
]}

Brezinsek, S. ^{[1
]}

Pintsuk, G. ^{[2
]}

Tanabe, T. ^{[3
]}

Ueda, Y. ^{[4
]}

Samm, U. ^{[1
]}

机构：

[1] Assoc EURATOM FZJ, Partner Trilateral Euregio Cluster, Forschungszentrum Julich GmbH, Inst Energy & Climate Res Plasma Phys, Julich, Germany

[2] Assoc EURATOM FZJ, Partner Trilateral Euregio Cluster, Forschungszentrum Julich GmbH, Inst Energy & Climate Res Microstruct & Propertie, Julich, Germany

[3] Kyushu Univ, Interdisciplinary Grad Sch Engn Sci, Higashiku, Fukuoka 8128581, Japan

[4] Osaka Univ, Grad Sch Engn, Suita, Osaka 5650871, Japan

来源：

PHYSICA SCRIPTA | 2011年 / T145卷

关键词：

D O I：

10.1088/0031-8949/2011/T145/014066

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The characteristics of W plasma-facing components under high heat fluxes were investigated in view of the material choice for the divertor in future fusion devices. Thin W sheets were exposed in the TEXTOR tokamak to multiple steady-state loads (20 MW at 36 degrees), resulting in substantial W melting. One sample was subjected to post-exposure edge localized mode (ELM) simulation in the electron beam facility JUDITH 1 to determine the modified behavior of the pre-damaged components. The material structure after exposure and the cracking thresholds and patterns under repetitive transient thermal loads were investigated. Grain sizes from the original mu m up to the mm range were observed. Void-like structures from the low mu m up to the mm range were found at different regions of the resolidified sample. Exposure of the molten and recrystallized specimens to ELM-like thermal loads revealed a shift of the cracking threshold towards 300 degrees C, indicating an unfavorable increase in the ductile-to-brittle transition temperature.

引用

页数：6

共 15 条

[1] Analysis of tungsten melt-layer motion and splashing under tokamak conditions at TEXTOR [J].

Coenen, J. W. ;

Philipps, V. ;

Brezinsek, S. ;

Bazylev, B. ;

Kreter, A. ;

Hirai, T. ;

Laengner, M. ;

Tanabe, T. ;

Ueda, Y. ;

Samm, U. .

NUCLEAR FUSION, 2011, 51 (08)

[2] Tungsten melt layer motion and splashing on castellated tungsten surfaces at the tokamak TEXTOR [J].

Coenen, J. W. ;

Bazylev, B. ;

Brezinsek, S. ;

Philipps, V. ;

Hirai, T. ;

Kreter, A. ;

Linke, J. ;

Sergienko, G. ;

Pospieszczyk, A. ;

Tanabe, T. ;

Ueda, Y. ;

Samm, U. .

JOURNAL OF NUCLEAR MATERIALS, 2011, 415 (01) :S78-S82

[3]

COENEN JW, 2010, P 23 INT C FUS EN 20, P10

[4]

ESPE W, 1959, WERKSTOFFKUNDE HOCHV

[5] Overview on stationary and transient divertor heat loads [J].

Herrmann, A .

PLASMA PHYSICS AND CONTROLLED FUSION, 2002, 44 (06) :883-903

[6] Cracking failure study of ITER-reference tungsten grade under single pulse thermal shock loads at elevated temperatures [J].

Hirai, T. ;

Pintsuk, G. ;

Linke, J. ;

Batilliot, M. .

JOURNAL OF NUCLEAR MATERIALS, 2009, 390-91 :751-754

[7] Performance of different tungsten grades under transient thermal loads [J].

Linke, J. ;

Loewenhoff, T. ;

Massaut, V. ;

Pintsuk, G. ;

Ritz, G. ;

Roedig, M. ;

Schmidt, A. ;

Thomser, C. ;

Uytdenhouwen, I. ;

Vasechko, V. ;

Wirtz, M. .

NUCLEAR FUSION, 2011, 51 (07)

[8]

LINKE J, 2010, P 23 INT C FUS EN DA, P10

[9] Power handling of a segmented bulk W tile for JET under realistic plasma scenarios [J].

Mertens, Ph. ;

Coenen, J. W. ;

Eich, T. ;

Huber, A. ;

Jachmich, S. ;

Nicolai, D. ;

Riccardo, V. ;

Senik, K. ;

Samm, U. .

JOURNAL OF NUCLEAR MATERIALS, 2011, 415 (01) :S943-S947

[10]

NACHTIGALL E., 2004, CHEM-ING-TECH, V27, P794

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