%0 Journal Article
%A Yuan, Y.
%A Greuner, H.
%A Böswirth, B.
%A Linsmeier, Ch.
%A Luo, G.-N.
%A Fu, B. Q.
%A Xu, H. Y.
%A Shen, Z. J.
%A Liu, W.
%T Surface modification of molten W exposed to high heat flux helium neutral beams
%J Journal of nuclear materials
%V 437
%N 1-3
%@ 0022-3115
%C Amsterdam [u.a.]
%I Elsevier Science
%M FZJ-2017-05165
%P 297 - 302
%D 2013
%X High heat flux tests with central heat flux of 10.5 MW/m2 using helium neutral beams have been carried out on rolled tungsten. The energy of helium particles is 33 keV and the particle flux is 2 × 1021 m−2 s−1. An 80 × 65 × 3 mm3 rolled tungsten plate is firstly exposed to a 4.6 s pulse resulting in partially molten surfaces. Thereafter the tungsten plate is irradiated by several helium pulses with fluences of 1.2–2.5 × 1022/m2 and peak temperatures from 1450 to 2590 °C. The experiments show that: (1) helium-induced surface modification of the resolidified tungsten surface is very different from that of the non-molten surface; (2) the surface morphology of molten surface is closely related to the orientation of the resolidified grain; (3) the evolution of surface modifications, for both of the molten and non-molten tungsten surfaces, indicates a strong dependence on the surface temperature and local helium fluence.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000319172200044
%R 10.1016/j.jnucmat.2013.02.043
%U https://juser.fz-juelich.de/record/836040