Abstract
In order to estimate hydrogen retention and recycling in high-Z plasma facing components, bulk hydrogen retention in molybdenum and tungsten co-existing with carbon has been studied. Hydrogen retention in powdered specimens of molybdenum and tungsten is considerably higher than that in sheet specimens due to surface impurities and defects. When molybdenum and tungsten are well carbonized, bulk hydrogen retention is drastically reduced. Coexisting carbon strongly suppresses hydrogen diffusion to reduce absorption rate into the specimen. Ion and neutron irradiation may produce free carbon to enhance the hydrogen retention in molybdenum and tungsten.
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