Helium concentration in tungsten nano-tendril surface morphology using Elastic Recoil Detection

TitleHelium concentration in tungsten nano-tendril surface morphology using Elastic Recoil Detection
Publication TypeJournal Article
Year of Publication2013
AuthorsK.B. Woller, D.G Whyte, G.M Wright, R.P Doerner, G. De Temmerman
JournalJournal of Nuclear Materials
Volume438, Supplement
PaginationS913 - S916
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.

URLhttp://www.sciencedirect.com/science/article/pii/S0022311513002067
DOI10.1016/j.jnucmat.2013.01.198
Division

PSI

Department

PSI-E

PID

c837857bdf07c70257d7c5281f1ee92d

Alternate TitleJ. Nucl. Mater.

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