Damage study of irradiated tungsten and copper using proton and argon ions of a plasma focus device

• Published in: Applied radiation and isotopes 2019-12, Vol.154, p.108875-108875, Article 108875
• Main Authors: Seyedhabashi, Mir mohammadreza, Tafreshi, Mohammad Amirhamzeh, Shirani bidabadi, Babak, Shafiei, Sepideh, Abdisaray, Akbar
• Format: Article
• Language: English
• Subjects: Plasma facing material; Plasma focus; Radiation damage
• ISSN: 0969-8043; 1872-9800
• DOI: 10.1016/j.apradiso.2019.108875

The destructive effects of proton and argon ions produced in a low energy plasma focus device on the surface of tungsten and copper were investigated. Optical microscopy, SEM, EDX, XRD and ERD analysis were performed for initial and irradiated samples. The results showed that total thermal impact under the irradiation by argon is much more significant than that by hydrogen. Sub-micrometer blisters, clusters of joined bubbles and rupture patterns were observed on the surface of copper after irradiation by argon. Micro-cracks were observed on the tungsten samples irradiated by argon, which indicate fast annealing of the molten surface. Many dense blisters and evidence of ion sputtering were observed on the surfaces irradiated by protons. Results of ERD analysis showed that the highest concentration of hydrogen is 24% in the second layer and at a depth of 20–55 nm from the tungsten surface. In the copper sample, the highest density of hydrogen was found to be 23% in the second layer and at a depth of 28–68 nm. Also, the highest penetration depth of protons into the tungsten and copper samples was 118 nm and 160 nm, respectively. •Plasma of Ar in PF device applied higher heat load to the surface in comparison with H2.•Clusters of joined bubbles were observed on the surface of metals under irradiation by argon plasma.•Highest penetration depth of protons into the tungsten and copper was 118 and 160 nm.