TY  - JOUR
AU  - De Temmerman, G.
AU  - Morgan, T. W.
AU  - van Eden, G. G.
AU  - de Kruif, T.
AU  - Wirtz, M.
AU  - Matejicek, J.
AU  - Chraska, T.
AU  - Pitts, R. A.
AU  - Wright, G. M.
TI  - Effect of High-flux H/He Plasma Exposure on Tungsten Damage Due to Transient Heat Loads
JO  - Journal of nuclear materials
VL  - 463
SN  - 0022-3115
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2015-07455
SP  - 198 - 201
PY  - 2015
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000358467200033
DO  - DOI:10.1016/j.jnucmat.2014.09.075
UR  - https://juser.fz-juelich.de/record/279571
ER  -