Hydrogen isotope exchange mechanism in tungsten studied by ERDA

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Abstract

Future fusion reactors use a D–T plasma mixture as fuel. A fraction of hydrogen species can escape the plasma confinement and hit the first wall. Hydrogen isotope exchange, a process in which trapped T atoms are replaced with lighter hydrogen isotopes D or H, is a potential method to minimize radioactive T retention in the wall materials. The present work extends our systematic research on isotope exchange by reversing the process, i.e. by implanting H ions into tungsten followed by subsequent annealing at different constant temperatures in D2 atmosphere. Elastic Recoil Detection Analysis was used to determine the H and D concentrations. The results show that the isotope exchange process takes place regardless of the mass of the active hydrogen isotope. This indicates that the isotope exchange is a statistical phenomenon in which the abundance of the neighboring hydrogen near the trapped hydrogen isotope defines the efficiency of the process.
Original languageEnglish
JournalPhysica Scripta
Volume2020
Issue numberT171
Number of pages4
Publication statusPublished - 16 Mar 2020
MoE publication typeA1 Journal article-refereed

Fields of Science

  • 114 Physical sciences

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