Effect of high-flux H/He plasma exposure on tungsten damage due to transient heat loads

TitleEffect of high-flux H/He plasma exposure on tungsten damage due to transient heat loads
Publication TypeJournal Article
Year of Publication2015
AuthorsG. De Temmerman, T.W Morgan, G.G van Eden, T. de Kruif, M. Wirtz, J Matejicek, T Chraska, R.A. Pitts, G.M Wright
JournalJournal of Nuclear Materials
Volume463
IssueAug
Pagination198 - 201
Abstract

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 = 19 MJ 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.

DOI10.1016/j.jnucmat.2014.09.075
Division

PSI

Department

PSI-E

PID

c773ffb016a2456d8b47efd335a41d59

Alternate TitleJ. Nucl. Mater.

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