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- W2110693144 abstract "Superpermeable membranes whose permeability to energetic hydrogen approaches the permeability of an opening of the same area can be employed to separate DT and He in fusion machine exhausts, to control the edge plasma and divertor conditions (by pumping and/or arranging of gas circulation through SOL or divertor) and to pump and recuperate DT in auxiliary systems e.g. in pellet or neutral beam injection. One of the key points is the operation at permeation flux densities of up to 1016–1019 cm−2 s−1. Theory predicts that the highest flux densities may be reached with superpermeable membranes based on the V group metals: the limit conditioned by a maximum permissible hydrogen concentration in bulk metal is expected to be as high as ∼ 1019 cm−2 s−1. The experimental membrane system comprised a cylindrical Nb membrane and an incandescent TaNb atomizer placed inside. The hydrogen pumping speed by this system amounts to ∼ 103 1/s, with a specific pumping speed of ∼ 1 1/s per cm2 membrane area and ∼ 8 1/s per cm2 atomizer area. Superpermeability was observed at record parameters referring both to the flux density of 3 × 1017 H/cm2/s (by one order of magnitude larger than ever before) and to the operational pressure of 3 × 10−2 Torr. A long-term reliable operation of this system proved being possible even in a vacuum far inferior to UHV conditions." @default.
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- W2110693144 date "1997-02-01" @default.
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- W2110693144 title "Applications of superpermeable membranes in fusion: The flux density problem and experimental progress" @default.
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- W2110693144 doi "https://doi.org/10.1016/s0022-3115(97)80221-8" @default.
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