PDP of Hydrogen Isotopes in a Low Temperature Plasma

M. Okamoto; T. Yoshida; M. Takizawa; M. Aida; M. Nomura; Y. Fujii

doi:dx.doi.org/10.13182/FST88-A25214

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Home / Publications / Journals / Fusion Science and Technology / Volume 14 / Number 2P2A

PDP of Hydrogen Isotopes in a Low Temperature Plasma

M. Okamoto, T. Yoshida, M. Takizawa, M. Aida, M. Nomura, Y. Fujii

Fusion Science and Technology / Volume 14 / Number 2P2A / September 1988 / Pages 689-694

Tritium Properties and Interactions with Material / Proceedings of the Third Topical Meeting on Tritium Technology in Fission, Fusion and Isotopic Applications (Toronto, Ontario, Canada, May 1-6, 1988) / dx.doi.org/10.13182/FST88-A25214

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An ECR plasma discharge device has been designed and operated to study plasma driven permeation initiated by a scrape-off plasma. The observed plasma parameters are n_e: 10¹⁰/cm³ and T_e: <5eV in the pressure (P_o) range of 0.5 − 5 Pa. Protium and deuterium permeation through a SS 304 foil of 10 µm has been measured as functions of the pressure, bias voltage and the temperature of the sample foil. Even such a low temperature plasma, a typical plasma driven permeation was observed with a very sharp“spike” at the start point of the permeation. An evident mass effect was also observed in the permeation of hydrogen isotopes. At a low pressure, around 2 Pa, the permeation showed to depend on bias voltages applied to the tested sample foil.