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Effect of high-flux H/He plasma exposure on tungsten damage due to transient heat loads
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SYSNO ASEP 0444972 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of high-flux H/He plasma exposure on tungsten damage due to transient heat loads Author(s) De Temmerman, G. (NL)
Morgan, T.W. (NL)
van Eden, G.G. (NL)
de Kruif, T. (NL)
Wirtz, M. (DE)
Matějíček, Jiří (UFP-V) RID, ORCID
Chráska, Tomáš (UFP-V) RID, ORCID
Pitts, R.A. (FR)
Wright, G.M. (US)Source Title Journal of Nuclear Materials. - : Elsevier - ISSN 0022-3115
Roč. 463, August (2015), s. 198-201Number of pages 4 s. Publication form Print - P Action PLASMA-SURFACE INTERACTIONS 21: International Conference on Plasma-Surface Interactions in Controlled Fusion Devices Event date 26.05.2014-30.05.2014 VEvent location Kanazawa Country JP - Japan Event type WRD Language eng - English Country NL - Netherlands Keywords plasma-facing components ; tungsten ; hydrogen ; helium ; ELM Subject RIV JF - Nuclear Energetics OECD category Nuclear related engineering R&D Projects GA14-12837S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 UT WOS 000358467200033 EID SCOPUS 84937705153 DOI 10.1016/j.jnucmat.2014.09.075 Annotation The thermal shock behaviour of tungsten exposed to high-flux plasma is studied using a high-power laser. The cases of laser-only, sequential laser and hydrogen (H) plasma and simultaneous laser plus H plasma exposure are studied. H plasma exposure leads to an embrittlement of the material and the appearance of a crack network originating from the centre of the laser spot. Under simultaneous loading, significant surface melting is observed. In general, H plasma exposure lowers the heat flux parameter (FHF) for the onset of surface melting by _25%. In the case of He-modified (fuzzy) surfaces, strong surface deformations are observed already after 1000 laser pulses at moderate FHF = 19MJ m_2 s_1/2, and a dense network of fine cracks is observed. These results indicate that high-fluence ITER-like plasma exposure influences the thermal shock properties of tungsten, lowering the permissible transient energy density beyond which macroscopic surface modifications begin to occur. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2016
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