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000279571 1001_ $$0P:(DE-HGF)0$$aDe Temmerman, G.$$b0$$eCorresponding author
000279571 245__ $$aEffect of High-flux H/He Plasma Exposure on Tungsten Damage Due to Transient Heat Loads
000279571 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2015
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000279571 520__ $$aThe thermal shock behaviour of tungsten exposed to high-flux plasma is studied using a high-power laser. The cases of laser-only, sequential laser and hydrogen (H) plasma and simultaneous laser plus H plasma exposure are studied. H plasma exposure leads to an embrittlement of the material and the appearance of a crack network originating from the centre of the laser spot. Under simultaneous loading, significant surface melting is observed. In general, H plasma exposure lowers the heat flux parameter (FHF) for the onset of surface melting by ∼25%. In the case of He-modified (fuzzy) surfaces, strong surface deformations are observed already after 1000 laser pulses at moderate FHF = 19 MJ m−2 s−1/2, and a dense network of fine cracks is observed. These results indicate that high-fluence ITER-like plasma exposure influences the thermal shock properties of tungsten, lowering the permissible transient energy density beyond which macroscopic surface modifications begin to occur.
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000279571 7001_ $$0P:(DE-HGF)0$$aMorgan, T. W.$$b1
000279571 7001_ $$0P:(DE-HGF)0$$avan Eden, G. G.$$b2
000279571 7001_ $$0P:(DE-HGF)0$$ade Kruif, T.$$b3
000279571 7001_ $$0P:(DE-Juel1)129811$$aWirtz, M.$$b4
000279571 7001_ $$0P:(DE-HGF)0$$aMatejicek, J.$$b5
000279571 7001_ $$0P:(DE-HGF)0$$aChraska, T.$$b6
000279571 7001_ $$0P:(DE-HGF)0$$aPitts, R. A.$$b7
000279571 7001_ $$0P:(DE-HGF)0$$aWright, G. M.$$b8
000279571 773__ $$0PERI:(DE-600)2001279-2$$a10.1016/j.jnucmat.2014.09.075$$gVol. 463, p. 198 - 201$$p198 - 201$$tJournal of nuclear materials$$v463$$x0022-3115$$y2015
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