Transient heat load challenges for plasma-facing materials during long-term operation

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Transient heat load challenges for plasma-facing materials during long-term operation. / Wirtz, Marius; Linke, Jochen; Loewenhoff, Thorsten; Pintsuk, Gerald; Uytdenhouwen, Inge.

In: Nuclear Materials and Energy, 27.12.2016, p. 1-8.

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Wirtz, Marius ; Linke, Jochen ; Loewenhoff, Thorsten ; Pintsuk, Gerald ; Uytdenhouwen, Inge. / Transient heat load challenges for plasma-facing materials during long-term operation. In: Nuclear Materials and Energy. 2016 ; pp. 1-8.

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@article{db3dbfd6033d4f35a2bde6c3416395d4,
title = "Transient heat load challenges for plasma-facing materials during long-term operation",
abstract = "The study summarizes the experimental results on fusion relevant pure heat load exposures of different tungsten products in the electron beam devices JUDITH 1 and 2. Besides steady state heat loading, up to 106 transient ELM-like pulses were applied. A detailed postmortem analysis reveals a wide and complex range of thermally-induced surface modifications and damages, such as roughening due to plastic deformation, cracking, and melting of parts of the material surface. Different industrially available tungsten products with varying thermal and mechanical properties were investigated in order to examine their influence on the thermal shock response. Furthermore, recrystallisation of the material, which will take place during long term operation, will additionally deteriorate the mechanical strength of the plasma facing material. The results show that the mechanical strength of the material has a significant influence on the formation and evolution of damage. Especially, recrystallisation and melting/resolidification will make the material more prone to thermal shock and fatigue, accelerating the evolution of damages. The combination of different material modifications/damages accompanied by the degradation of mechanical properties will have a strong impact on the plasma performance and lifetime of plasma facing materials/components.",
keywords = "Tungsten, edge localised mode, transient thermal loads, material degradation, high pulse numbers, recrystallisation",
author = "Marius Wirtz and Jochen Linke and Thorsten Loewenhoff and Gerald Pintsuk and Inge Uytdenhouwen",
note = "Score=10",
year = "2016",
month = "12",
day = "27",
doi = "10.1016/j.nme.2016.12.024",
language = "English",
pages = "1--8",
journal = "Nuclear Materials and Energy",
issn = "2352-1791",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Transient heat load challenges for plasma-facing materials during long-term operation

AU - Wirtz, Marius

AU - Linke, Jochen

AU - Loewenhoff, Thorsten

AU - Pintsuk, Gerald

AU - Uytdenhouwen, Inge

N1 - Score=10

PY - 2016/12/27

Y1 - 2016/12/27

N2 - The study summarizes the experimental results on fusion relevant pure heat load exposures of different tungsten products in the electron beam devices JUDITH 1 and 2. Besides steady state heat loading, up to 106 transient ELM-like pulses were applied. A detailed postmortem analysis reveals a wide and complex range of thermally-induced surface modifications and damages, such as roughening due to plastic deformation, cracking, and melting of parts of the material surface. Different industrially available tungsten products with varying thermal and mechanical properties were investigated in order to examine their influence on the thermal shock response. Furthermore, recrystallisation of the material, which will take place during long term operation, will additionally deteriorate the mechanical strength of the plasma facing material. The results show that the mechanical strength of the material has a significant influence on the formation and evolution of damage. Especially, recrystallisation and melting/resolidification will make the material more prone to thermal shock and fatigue, accelerating the evolution of damages. The combination of different material modifications/damages accompanied by the degradation of mechanical properties will have a strong impact on the plasma performance and lifetime of plasma facing materials/components.

AB - The study summarizes the experimental results on fusion relevant pure heat load exposures of different tungsten products in the electron beam devices JUDITH 1 and 2. Besides steady state heat loading, up to 106 transient ELM-like pulses were applied. A detailed postmortem analysis reveals a wide and complex range of thermally-induced surface modifications and damages, such as roughening due to plastic deformation, cracking, and melting of parts of the material surface. Different industrially available tungsten products with varying thermal and mechanical properties were investigated in order to examine their influence on the thermal shock response. Furthermore, recrystallisation of the material, which will take place during long term operation, will additionally deteriorate the mechanical strength of the plasma facing material. The results show that the mechanical strength of the material has a significant influence on the formation and evolution of damage. Especially, recrystallisation and melting/resolidification will make the material more prone to thermal shock and fatigue, accelerating the evolution of damages. The combination of different material modifications/damages accompanied by the degradation of mechanical properties will have a strong impact on the plasma performance and lifetime of plasma facing materials/components.

KW - Tungsten

KW - edge localised mode

KW - transient thermal loads

KW - material degradation

KW - high pulse numbers

KW - recrystallisation

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/25234041

U2 - 10.1016/j.nme.2016.12.024

DO - 10.1016/j.nme.2016.12.024

M3 - Article

SP - 1

EP - 8

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

SN - 2352-1791

ER -

ID: 2705767