Tungsten nano-tendril growth in the Alcator C-Mod divertor

G.M. Wright, D. Brunner, B. Labombard, B. Lipschultz, J.L. Terry, D.G. Whyte, M.J. Baldwin, R.P. Doerner

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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 (50100nm) and the depth of the layer (600150nm) 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.
Original languageEnglish
Article number042003
JournalNuclear fusion
Issue number4
Publication statusPublished - 1 Apr 2012

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