Surface modification of molten W exposed to high heat flux helium neutral beams
2013 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 437, no 1-3, 297-302 p.Article in journal (Refereed) Published
High heat flux tests with central heat flux of 10.5 MW/m(2) 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 x 10(21) m(-2) s(-1). An 80 x 65 x 3 mm(3) 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 x 10(22)/m(2) and peak temperatures from 1450 to 2590 degrees 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.
Place, publisher, year, edition, pages
2013. Vol. 437, no 1-3, 297-302 p.
Materials Chemistry Materials Engineering
IdentifiersURN: urn:nbn:se:su:diva-92016DOI: 10.1016/j.jnucmat.2013.02.043ISI: 000319172200044OAI: oai:DiVA.org:su-92016DiVA: diva2:637368