Evaluation of thermal structural behavior of divertor under ELM

Hyoseong Gwon; Shinzaburo Matsuda; Ryuta Kasada; Satoshi Konishi

doi:10.1016/j.fusengdes.2015.02.015

Evaluation of thermal structural behavior of divertor under ELM

Hyoseong Gwon, Shinzaburo Matsuda, Ryuta Kasada, Satoshi Konishi

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

In this study, a YAG laser was used to simulate the transient heat load like ELM for the tungsten target, and the experiment results were compared with the analysis results by using finite element method. Average of total heat flux, ELM energy flux, and pulse width of ELM was considered as parameters in the analysis. Based on the results the thermal structural behavior of tungsten target under ELM was evaluated. When approximately 0.25 MJ/m² of ELM energy flux was applied, crack, and plastic deformation occurred at the tungsten surface even though recrystallization was not confirmed. It implied that the tungsten target could be damaged by thermal stress even at below 0.5 MJ/m². In addition the crack propagation under ELM was also investigated in this study.

Original language	English
Pages (from-to)	1318-1322
Number of pages	5
Journal	Fusion Engineering and Design
Volume	98-99
DOIs	https://doi.org/10.1016/j.fusengdes.2015.02.015
Publication status	Published - 2015 Oct 1
Externally published	Yes

Keywords

Critical ELM energy flux
ELM
Thermal stress

ASJC Scopus subject areas

Civil and Structural Engineering
Nuclear Energy and Engineering
Materials Science(all)
Mechanical Engineering

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title = "Evaluation of thermal structural behavior of divertor under ELM",

abstract = "In this study, a YAG laser was used to simulate the transient heat load like ELM for the tungsten target, and the experiment results were compared with the analysis results by using finite element method. Average of total heat flux, ELM energy flux, and pulse width of ELM was considered as parameters in the analysis. Based on the results the thermal structural behavior of tungsten target under ELM was evaluated. When approximately 0.25 MJ/m2 of ELM energy flux was applied, crack, and plastic deformation occurred at the tungsten surface even though recrystallization was not confirmed. It implied that the tungsten target could be damaged by thermal stress even at below 0.5 MJ/m2. In addition the crack propagation under ELM was also investigated in this study.",

keywords = "Critical ELM energy flux, ELM, Thermal stress",

author = "Hyoseong Gwon and Shinzaburo Matsuda and Ryuta Kasada and Satoshi Konishi",

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journal = "Fusion Engineering and Design",

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T1 - Evaluation of thermal structural behavior of divertor under ELM

AU - Gwon, Hyoseong

AU - Matsuda, Shinzaburo

AU - Kasada, Ryuta

AU - Konishi, Satoshi

PY - 2015/10/1

Y1 - 2015/10/1

N2 - In this study, a YAG laser was used to simulate the transient heat load like ELM for the tungsten target, and the experiment results were compared with the analysis results by using finite element method. Average of total heat flux, ELM energy flux, and pulse width of ELM was considered as parameters in the analysis. Based on the results the thermal structural behavior of tungsten target under ELM was evaluated. When approximately 0.25 MJ/m2 of ELM energy flux was applied, crack, and plastic deformation occurred at the tungsten surface even though recrystallization was not confirmed. It implied that the tungsten target could be damaged by thermal stress even at below 0.5 MJ/m2. In addition the crack propagation under ELM was also investigated in this study.

AB - In this study, a YAG laser was used to simulate the transient heat load like ELM for the tungsten target, and the experiment results were compared with the analysis results by using finite element method. Average of total heat flux, ELM energy flux, and pulse width of ELM was considered as parameters in the analysis. Based on the results the thermal structural behavior of tungsten target under ELM was evaluated. When approximately 0.25 MJ/m2 of ELM energy flux was applied, crack, and plastic deformation occurred at the tungsten surface even though recrystallization was not confirmed. It implied that the tungsten target could be damaged by thermal stress even at below 0.5 MJ/m2. In addition the crack propagation under ELM was also investigated in this study.

KW - Critical ELM energy flux

KW - ELM

KW - Thermal stress

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