Shinku
Online ISSN : 1880-9413
Print ISSN : 0559-8516
ISSN-L : 0559-8516
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Volume 37, Issue 1
Displaying 1-4 of 4 articles from this issue
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  • Recent Problems in Vacuum Heat Treatment
    Kyuhiko YAMANAKA
    1994 Volume 37 Issue 1 Pages 1-4
    Published: January 20, 1994
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.37.1
    JOURNAL FREE ACCESS
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  • Pumping Characteristics of Zr-V-Fe Nonevaporable Getter In Mixture of H2 and CO Gases
    Sang Ryul IN, Suck Hee BE
    1994 Volume 37 Issue 1 Pages 5-9
    Published: January 20, 1994
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.37.5
    JOURNAL FREE ACCESS
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    The effect of impure gases on the vacuum performance of a Zr-V-Fe nonevaporable getter (NEG) module were investigated using a gas mixture composed of 80% H2 and 20% CO to simulate a practical vacuum environment. Pumping speeds for H2 and CO in the mixture were measured simultaneously and continuously with two quadrupole mass analyzers in a standard test dome. The pumping speed for H2 was strongly influenced by CO molecules absorbed on the surface of the NEG, while that of CO was nearly independent of H2 absorbed in the NEG. The H2 pumping speed in the mixture with CO was changed very steeply, similarly to that of CO.
    It is expected that the results of the mixed gas experiment will be utilized to devise a proper operation schedules of the NEG pumps installed in the SPring-8 storage ring.
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  • Internal Stress in Mo/Si X-Ray Multilayered Films Deposited by DC Magnetron Sputtering
    Kunio NAKAJIMA, Shuzo SUDO, Sadao AOKI
    1994 Volume 37 Issue 1 Pages 10-16
    Published: January 20, 1994
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.37.10
    JOURNAL FREE ACCESS
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    Molybdenum-silicon (Mo/Si) X-ray multilayered mirrors were deposited onto Si substrates by dc magnetron sputtering. Internal stress in the films was investigated through the measurement of substrate deformation. When compressive stress was larger, a higher X-ray reflectivity was obtained for the Mo/Si multilayer mirror. However, when a large internal stress was produced in the films, the deflection of the substrate became larger. The substrate must be thickened in order to reduce its deflection. It is concluded that the deflection by internal stress, which deteriorates the precision of the mirror, can be neglected for substrates more than about 12 mm thick.
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  • Resonant Doppler velocimetry of He flow discharge
    Chizu SEKINE, Shigeyuki SEKINE, Akihide WADA, Chiaki HIROSE
    1994 Volume 37 Issue 1 Pages 17-21
    Published: January 20, 1994
    Released on J-STAGE: September 29, 2009
    DOIhttps://doi.org/10.3131/jvsj.37.17
    JOURNAL FREE ACCESS
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    We demonstrated the resonant Doppler velocimetry of He atoms in a flowing DC plasma. The laser-induced emission of He atoms was detected while the wavelength of a dye laser was scanned (LIF excitation spectroscopy), and the flow velocity was derived from the Doppler shift of the observed spectral line. The overall accuracy of measured velocity was 30-60 ms-1. We found that flow velocity exhibited a significant dependence on the discharge current at a constant flow rate. We also observed a spectrum by the LIF excitation method combined with Lamb's dip technique. The combination method was useful when the spectral line exhibited Stark shift.
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