Prediction of temperature range for the onset of fuzz formation in helium-plasma-implanted tungsten

SURFACE SCIENCE

卷:698

Article

Dasgupta, Dwaipayan¹  Maroudas, Dimitrios²  Wirth, Brian D.^1,3 

[1] Univ Tennessee, Dept Nucl Engn, Knoxville, TN 37996 USA

[2] Univ Massachusetts, Dept Chem Engn, Amherst, MA 01003 USA

[3] Oak Ridge Natl Lab, Fus Energy Div, POB 2009, Oak Ridge, TN 37831 USA

关键词: Fuzz;    Tungsten;    Helium irradiation;    Plasma-facing components;    Surface morphological evolution model;    Effect of temperature;   

DOI  :  10.1016/j.susc.2020.121614

来源: Elsevier

【 摘 要 】

We describe model predictions of the temperature dependence for the formation of fuzz, a nanofiber-like surface feature, on helium-plasma-irradiated tungsten surfaces under conditions similar to those at the divertor of fusion reactors. Temperature influences the onset of fuzz formation through the strongly temperature-dependent pressure of subsurface helium bubbles formed by plasma implantation and surface diffusivity of tungsten, in addition to the thermal softening of the elastic moduli of tungsten. We explore the effects of helium concentration in the plasma-implanted tungsten and helium bubble size, report surface response diagrams predicted over a broad temperature range, and interpret the trends exhibited in such diagrams.

【 授权许可】

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