@article{7706,
  author = {K.B. Woller and D. G. Whyte and G. M. Wright and R. P. Doerner and G. De Temmerman},
  title = {Helium concentration in tungsten nano-tendril surface morphology using Elastic Recoil Detection},
  abstract = {Helium (He) concentrations in tungsten nano-tendrils (W fuzz) have been measured for the first time using Elastic Recoil Detection (ERD). Fuzzy and non-fuzzy W surfaces were analyzed in order to illuminate the role of He in the transition in surface morphologies. Samples grown in the PISCES-A and PILOT-PSI experiments allowed a survey of surface temperature ranging from Ts 470–2595 K and of He fluence on the order of ΦHe ∼1024–1027 ions/m2. He concentrations measured in the bulk of W fuzz layers are roughly uniform with bulk He concentration 1–4 at.% while samples with just He in the near surface peaked at 1–2 at.%. This confirms that the nano-tendrils are filled with high pressure He bubbles since the solubility of He in W is ∼10−5 at.%. This indicates that the ∼1000 K temperature fuzz-growth threshold is determined by the response of the W, not the near-surface He concentration.},
  year = {2013},
  journal = {Journal of Nuclear Materials},
  volume = {438, Supplement},
  pages = {S913 - S916},
  url = {http://www.sciencedirect.com/science/article/pii/S0022311513002067},
  doi = {http://dx.doi.org/10.1016/j.jnucmat.2013.01.198},
  note = {Proceedings of the 20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices},
  language = {eng},
}