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1982•Journal of Vacuum Science and TechnologyRequires access

Hydrogen and helium pumping by plasma-wall interaction

R.A. Kerst

Open publisher page 6 citations

Abstract

Recycling of hydrogen and helium from the SS 304 wall of a plasma discharge experiment has been studied. Hydrogen recycling was dominated by diffusion and recombination; however, helium recycling was dominated by trapping. Detrapping of both hydrogen and helium was observed during a discharge of the opposite species. The density of trapped H from previous hydrogen discharges is estimated to be 1.4×1015 cm−2. Vacancies created in the oxide layer by the implanted ions are suggested as the trapping mechanism.

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What this paper is about

Recycling of hydrogen and helium from the SS 304 wall of a plasma discharge experiment has been studied. Hydrogen recycling was dominated by diffusion and recombination; however, helium recycling was dominated by trapping. Detrapping of both hydrogen and helium was observed during a discharge of the opposite species. The density of trapped H from previous hydrogen discharges is estimated to be 1.4×1015 cm−2. Vacancies created in the oxide layer by the implanted ions are suggested as the trapping mechanism.

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Available abstract

Recycling of hydrogen and helium from the SS 304 wall of a plasma discharge experiment has been studied. Hydrogen recycling was dominated by diffusion and recombination; however, helium recycling was dominated by trapping. Detrapping of both hydrogen and helium was observed during a discharge of the opposite species. The density of trapped H from previous hydrogen discharges is estimated to be 1.4×1015 cm−2. Vacancies created in the oxide layer by the implanted ions are suggested as the trapping mechanism.

Key concepts: Helium, Hydrogen, Trapping, Plasma, Atomic physics, Ion, Diffusion, Recombination

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