Thermal shock behaviour of tungsten after high flux H-plasma loading

Previous studies have shown that transient thermal shock loads induce crack networks on tungsten samples especially at low base temperatures. To achieve test conditions which are more relevant for the performance of tungsten-armoured plasma facing components in next step thermonuclear fusion devices...

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Bibliographic Details
Published inJournal of nuclear materials Vol. 443; no. 1-3; pp. 497 - 501
Main Authors Wirtz, M., Linke, J., Pintsuk, G., De Temmerman, G., Wright, G.M.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.11.2013
Elsevier
Subjects
Applied sciences
Controled nuclear fusion plants
Cracks
Damage
Devices
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fission nuclear power plants
Flux
Fuels
Installations for energy generation and conversion: thermal and electrical energy
Networks
Nuclear fuels
Thermal shock
Tiles
Tungsten
Plasma
Hydrogen
Electron beam
Heat flow
Plasma generator
Thermonuclear fusion
Nuclear reactor
Nuclear fusion reactor
Test facility
Tungsten
Cyclic load
Surface plasma interaction
Damaging
Crack
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Summary:Previous studies have shown that transient thermal shock loads induce crack networks on tungsten samples especially at low base temperatures. To achieve test conditions which are more relevant for the performance of tungsten-armoured plasma facing components in next step thermonuclear fusion devices tungsten tiles were exposed to high flux hydrogen-plasma in the linear plasma generator Pilot-PSI and the high heat flux ion beam test facility MARION. Subsequently, the cyclic transient heat load tests were done in the electron beam facility JUDITH 1. The induced damages after these combined tests were examined by microscopically means, profilometry and metallography. The comparison of the obtained results and damage characteristics with those obtained after thermal shock loading show that the preloading of tungsten targets with high flux hydrogen-plasma has significant influence on the thermal shock behaviour of tungsten in terms of crack distance, width, and depth as well as cracked area. Furthermore the plasma parameters, in particular pulse duration and sample temperature during loading, have strong impact on the damage pattern after thermal shock loading.
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ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2013.08.002