Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6743140 | Fusion Engineering and Design | 2018 | 5 Pages |
Abstract
Nitrogen seeding is considered to be used to reduce the power load onto tungsten divertor armors in tokamaks. Consequently, plasma-material interactions will be affected by seeded nitrogen impurities. The influence of nitrogen pre-irradiation on deuterium induced blistering and deuterium retention in rolled tungsten has been investigated at different pre-irradiation temperatures in the linear plasma device STEP with ion flux >1021â¯mâ2â¯sâ1. Commercially rolled W samples were sequentially exposed to nitrogen plasma (380â¯K and 470â¯K) and deuterium plasma (510â¯K). Surface observations show that nitrogen pre-irradiation suppresses deuterium-induced surface blistering. Thermal desorption spectroscopy measurements indicate that deuterium retention in the rolled tungsten is reduced due to nitrogen pre-irradiation, and it significantly changes with the pre-irradiation temperature. These phenomena are supposed to be related to the formation and change of WNxs at different temperatures which is validated by X-ray photoelectron spectroscopy analyses.
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Authors
Shaoyang Qin, Jinliang Wang, Long Cheng, Jun Wang, Yue Yuan, Guang-Hong Lu,