Helium effects on tungsten under fusion-relevant plasma loading conditions
Author | |
Abstract |
Experiments were performed in the Pilot-PSI linear plasma device to study the formation of helium-induced nanostructures under high heat fluxes (>10 MW m−2), the erosion of a tungsten surface at the elevated temperatures where those structures typically form and most importantly the behavior of a helium-induced fibreform structure during ELM-like pulses. A strong correlation between the characteristic size of the helium-induced morphology and the size of the voids observed in the near-surface region has been found, and both increase in size with increasing temperatures. Temperature-dependent erosion of tungsten surfaces was observed despite the ion energy being below the sputtering threshold, with an exponential increase of the erosion for temperatures higher than 2400 °C. The same effect was observed during ELM-like plasma pulses. Finally, a complete disappearance of the tungsten fibreform structure was observed after only one plasma pulse for energy densities higher than 0.5 MJ m−2. |
Year of Publication |
2013
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Journal |
Journal of Nuclear Materials
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Volume |
438, Supplement
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Number of Pages |
S78 - S83
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DOI |
http://dx.doi.org/10.1016/j.jnucmat.2013.01.012
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PId |
bf67026814af3d27716092cb6e6ed6f1
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Alternate Journal |
J. Nucl. Mater.
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Label |
OA
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Attachment | |
Journal Article
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