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Author(s):
T. Mori, K. Akaishi, Y. Kubota, O. Motojima, M. Mushiaki, Y. Funato and Y. Hanaoka
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Title:
Pumping Experiment of Water on B and LaB6 Films with Electron Beam Evaporator
Date of publication:
Oct. 1992
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Key words:
LHD, boronization, boron, lanthanum hexaboride, getter action for water, pumping speed of water, electron beam evaporation
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Abstract:
Pumping characteristics of water vapor on boron and lanthanum hexaboride films formed with an electron beam evaporator have been investigated in high vacuum of a pressure region between l0^-4 and l0^-3 Pa. Measured initial maximum pumping speeds of water for fresh B and LaB_6 films on substrates with a deposition amount from 2.3 x l0^21 to 6.7 x l0^21 molecules bullet m^-2 are 3.2 ~ 4.9 m^3 bullet s^-1 bullet m^-2, and maximum saturation amounts of adsorbed water on these films are 2.9 x l0^20 ~ 1.3 x l0^21 H_2O molecules bullet m^-2.
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