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Online ISSN : 1880-9413
Print ISSN : 0559-8516
ISSN-L : 0559-8516
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Volume 6, Issue 8
Displaying 1-3 of 3 articles from this issue
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  • Cryogenic Engineering
    Hiroo YONEMITSU
    1963 Volume 6 Issue 8 Pages 301-308
    Published: August 20, 1963
    Released on J-STAGE: January 28, 2010
    DOIhttps://doi.org/10.3131/jvsj.6.301
    JOURNAL FREE ACCESS
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  • Developement of a Time Resolved Type Mass Spectrometer and its Application to the Studies of Arc Quenching Phenomena in SF6 Gas
    Toshio MIYAMOTO, Akihiro KAMATANI, Masayuki GOTOH
    1963 Volume 6 Issue 8 Pages 309-319
    Published: August 20, 1963
    Released on J-STAGE: January 28, 2010
    DOIhttps://doi.org/10.3131/jvsj.6.309
    JOURNAL FREE ACCESS
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    Among the fundamental studies of arc quenching phenomena, principal concern is the physico-chemical properties of arc space. In either are quenching medium, interruption is made in the gas phase where, exitation, dessociation and recombination processes are undergone and these processes largely affect the arc quenching performance.
    Sulfur hexafluoride gas, SF6 has been found to have favorable properties for use as an arc quenching medium. This polyatomic gas shows very complicated physico-chemical behaviors when it is subjected to arcing. For the quantitative understanding of arc quenching performance in SF6, it is of great importance to investigate the rapid reaction in gas phase.
    A time resolved type mass spectrometer has been developed for this purpose and successfully applied to the studies of arc qnenching phenomena in various gases, including SF6.
    Basically, the instrument is a conventional 60° secter mass spectrometer modified for fast sampling, with peaks scanned electrostatically in a saw-tooth manner. The collector is an ion-electron multiplier and peaks are displayed on oscilloscope. The gas reaction to be studied takes place in a miniature arc chamber mounted next to the ion source.
    In this paper, a detailed description is given of the instrument and its application.
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  • A Measurement of Mean Adsorption Time of Oil Molecules by the Non-Stationary Flow Method (Part I)
    Goroh TOMINAGA, Yutaka TUZI, Muntaek KIM
    1963 Volume 6 Issue 8 Pages 320-328
    Published: August 20, 1963
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.6.320
    JOURNAL FREE ACCESS
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    The adsorption time of oil molecules on the vacuum chamber wall plays an important role on evacuation process of a vacuum system with oil diffusion pump. As the adsorption time of pump fluid molecules is considerably long, it takes a very long time until vapor of pump fluids establishes stationary flow through piping. This is the reason why ultimate pressure of a well-designed vacuum system evacuated by oil diffusion pump can be much less than the vapor pressure of pump fluids. Furthermore, such a pressure is kept for a long time, even when liquid nitrogen trap is not used, as was shown by D. Alpert.
    By measuring the time lag in setting up the stationary flow of oil vapor (di-2-ethyl-hexyl phthalate ; DOP), the adsorption time is obtained at 50 to 85°C on borosillicate glass. The activation energy of desorption calculated from the adsorption time is about 22 kcal/mole for DOP, which is almost equal to the heat of vaporization.
    Conditions for measurements are also discussed in detail.
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