Nuclear Materials and Energy (Aug 2017)

Measuring temperature effects on nano-bubble growth in tungsten with grazing incidence small angle X-ray scattering

  • Matt Thompson,
  • Russ Doerner,
  • Noriyasu Ohno,
  • Nigel Kirby,
  • Patrick Kluth,
  • Daniel Riley,
  • Cormac Corr

Journal volume & issue
Vol. 12
pp. 1294 – 1297

Abstract

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W samples were exposed to He plasma in the MAGPIE, NAGDIS-II and PISCES-A across a range of sample temperatures between 473–1123K. GISAXS was used to quantify the effect of plasma fluence and W surface temperature on He nano-bubble size distributions. In NAGDIS-II at 873K nano-bubbles are exponentially distributed with mean diameters μ=0.64±0.01nm, similar to the value of μ=0.62±0.01nmfound for the MAGPIE plasma device at the much lower temperature of 473K. Above ∼900K nano-bubbles followed an approximately exponential distribution with μ > 0.72 nm demonstrating a significant increase in nano-bubble sizes at higher temperatures.