|Title||Helium concentration in tungsten nano-tendril surface morphology using Elastic Recoil Detection|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||K.B. Woller, D.G Whyte, G.M Wright, R.P Doerner, G. De Temmerman|
|Journal||Journal of Nuclear Materials|
|Pagination||S913 - S916|
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.
|Alternate Title||J. Nucl. Mater.|
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