Growth process of nano-tendril bundles with sputtered tungsten

•Nano-tendril bundles (NTBs) morphologies were dependent on net erosion yield of sample.•The size and the number of NTBs increased with increasing the ion fluence—Micro-protrusions continuously formed regardless of ion fluence.•Sputtering and re-deposition process would enable micro-protrusions to g...

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Bibliographic Details
Published in:Nuclear materials and energy 2019-01, Vol.18, p.250-257
Main Authors: Hwangbo, Dogyun, Kajita, Shin, Tanaka, Hirohiko, Ohno, Noriyasu
Format: Article
Language:English
Subjects:
Deposition
Fuzz
Helium
Impurity seeding
Sputtering
Tungsten
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Summary:•Nano-tendril bundles (NTBs) morphologies were dependent on net erosion yield of sample.•The size and the number of NTBs increased with increasing the ion fluence—Micro-protrusions continuously formed regardless of ion fluence.•Sputtering and re-deposition process would enable micro-protrusions to grow larger and become NTBs. Nano-tendril bundles (NTBs) were generated in DC He plasma with impurity gas-seeding (Ne and N2) under sputtering-dominated conditions. NTB morphologies were characterized using the net erosion yield of samples. NTBs’ height and area were analyzed and ion fluence dependence was discussed. For both impurities, the number of NTBs increased steadily with increasing the fluence. It was revealed that NTB can be generated newly and continuously regardless of ion fluence. Surface observations suggested that micro-protrusions can evolve into NTBs. The effect of re-deposition of W was discussed based on SEM observations. Line-of-sight deposition seemed to play a key role of W feeder to enable NTBs to grow greater.
ISSN:2352-1791
2352-1791
DOI:10.1016/j.nme.2019.01.008