MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Microstructures and Deuterium-Retention Behavior of Tungsten Exposed to D+(He and/or Be) Mixture Plasmas
Mitsutaka MiyamotoDaisuke NishijimaMatthew J. BaldwinRussell P. DoernerYoshio UedaAkio SagaraHiroaki Kurishita
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2013 Volume 54 Issue 4 Pages 420-424

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Abstract

ITER-relevant mixed species (D, He, Be) plasma exposure experiments on microstructural changes and their impacts on D retention behavior in W are reviewed. It was observed that seeding of He into pure D plasma resulted in a significant reduction of D retention and suppression of surface blistering. TEM observations and ellipsometric measurements revealed that nano-sized high-density He bubbles were formed and percolated in the near surface region. Based on the experimental results, a mechanism to explain the reduced D retention was proposed, i.e., implanted D atoms can easily diffuse back to the surface through the percolating bubbles and escape from the surface during plasma exposure. Additional Be seeding to D+He mixture plasma suppressed this He seeding effect. Thus, it is considered that Be seeding has a more dominant influence than He seeding on microstructures and D retention in plasma-exposed W.

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© 2012 The Japan Institute of Metals
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