Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
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Volume 15, Issue 6
Displaying 1-4 of 4 articles from this issue
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  • The stability of three-components (electron, ion and beam) plasma system
    Tosniro Ohnuma, Yoshisuke Hatta
    1965 Volume 15 Issue 6 Pages 637-660
    Published: 1965
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.15.637
    JOURNAL FREE ACCESS
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    The stability of three components plasma (electron, ion and beam) is investigated mainly by means of a graphical solution of the dispersion equation.
    Three types of growing plasma waves are manifested in kinetic theory approach. The first type is the electron wave due to the coupling of an electron beam with the electron. The second type is the electron-ion wave. (Hybrid acoustic mole) due to the coupling of the electron beam with the ion or an ion beam with the electron. The third is the ion wave due to the coupling of the ion beam with the ion.
    We determined the region of instability as a function of wave number and beam velocity, and show how the region depend on beam temperature, beam density and ion mass. The shielding effect and the Landau damping effect of the electron appear in the region of the electron-ion wave in case of the electron beam and in the region of the ion wave in case of the ion beam.
    For the ion beam, we give the maximum-growth rate as a function of beam velocity, and show how the rate depends on the temperature of the electron. The structure of the unstable region is also indicated by the lines of constant growth rate.
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  • Detection of Small Fringe Shift of Optical Interferometer
    Susumu Takeda, Kazuo Minami, Ryosuke Matsuoka
    1965 Volume 15 Issue 6 Pages 661-667
    Published: 1965
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.15.661
    JOURNAL FREE ACCESS
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    An extremely sensitive optical interferometer system is developed.
    In order to eliminate the effect of mechanical vibrations on the detection of very small phase shifts produced by a light through a plasma which constitutes one arm of a Mach-Zehnder-interferometer, the triggering of an oscilloscope and a gap switch which starts the discharge is controlled by a pulse generator. The output pulse signals are produced at times only when the signal from a photomultiplier meets the most sensitive position of the fringes. Moreover, a manual switch connects the pulse generator to triggering terminals of the oscilloscope and the gap switch.
    The minimum electron density here detected is 8 x 1013cm-3for the wave length 5463Å. This sensitivity which corresponds to 1.5 x 1013cm-3for 3.39 micron of a He-Ne laser system overlaps the.maximum detectable electron density of a 8 mm microwave interferometer.
    Any type of optical interferometers which are limited their sensitivity by mechanical vibration will be improved to have a higher sensitivity more than an order of magnitude by adding the system here mentioned.
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  • Interaction of Laser with Plasma
    Chiyoe YAMANAKA, Masahiro YOKOYAMA, Tatsuhiko YAMANAKA, Yasukazu IZAWA
    1965 Volume 15 Issue 6 Pages 674-687
    Published: 1965
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.15.674
    JOURNAL FREE ACCESS
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  • Erratum to : Moving striation and. helical oscillation in a positive column
    1965 Volume 15 Issue 6 Pages 712
    Published: 1965
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.15.6_712
    JOURNAL FREE ACCESS
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