Tungsten nano-tendril growth in the Alcator C-Mod divertor
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Whyte_Tungsten nano-tendril.pdf
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5.74 MB
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Author(s)
Baldwin, M. J.
Doerner, R. P.
Wright, Graham
Brunner, Daniel Frederic
Labombard, Brian
Lipschultz, Bruce
Terry, James L
Whyte, Dennis G
Date Issued
March 2012
Journal
Nuclear Fusion
Publisher
IOP Publishing
Citation
Wright, G.M. et al. “Tungsten Nano-tendril Growth in the Alcator C-Mod Divertor.” Nuclear Fusion 52.4 (2012): 042003.
Version
Author's final manuscript
Abstract
Growth of tungsten nano-tendrils ('fuzz') has been observed for the first time in the divertor region of a high-power density tokamak experiment. After 14 consecutive helium L-mode discharges in Alcator C-Mod, the tip of a tungsten Langmuir probe at the outer strike point was fully covered with a layer of nano-tendrils. The thickness of the individual nano-tendrils (50–100 nm) and the depth of the layer (600 ± 150 nm) are consistent with observations from experiments on linear plasma devices. The observation of tungsten fuzz in a tokamak may have important implications for material erosion, dust formation, divertor lifetime and tokamak operations in next-step devices.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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Creative Commons Attribution-Noncommercial-Share Alike 3.0
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DOI of Published Version
https://doi.org/10.1088/0029-5515/52/4/042003
