Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
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Volume 18, Issue 1
Displaying 1-3 of 3 articles from this issue
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  • High-speed Plasma Flow in a Cusped Magnetic Field
    Masatoshi Tanaka
    1966 Volume 18 Issue 1 Pages 1-18
    Published: 1966
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.18.1
    JOURNAL FREE ACCESS
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    High-speed plasma flow in a cusped geometry is investigated in the free-particle approximation to get some clue to the injection of a rarefied plasma into a cusped magnetic field. The density distribution of the plasma in a plane perpendicular to the axis of the field, say z=zo, is known and plasma ions there have a Maxwellian distribution of velocities. Our aim is to calculate the ion density in the downstream flow. The collision-free Boltzmann. equation is solved successively by assuming that the flow velocity is much larger than the mean thermal velocity of the ions. When the radial density distribution at z=zo is gaussian the downstream density distribution turns out also gaussian and its amplitude oscillate along the axis with a period of the order of 4V/Ωo, where V is the flow velocity and Ωo is the ion cyclotron frequency atZ=Zo
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  • Cooperative Scattering of a Laser Beam by Shock Produced Plasma
    Yasukazu Izawa, Masahiro Yokoyama, Chiyoe Yamanaka
    1966 Volume 18 Issue 1 Pages 12-16
    Published: 1966
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.18.12
    JOURNAL FREE ACCESS
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    This report describes the observation of cooperative scattering of a Q-switched ruby laser light by shock produced plasma. The spectral distribution of the scattered light was measured using a grating spectroscope at an angle of 90° and 45° to the direction of the ruby laser light. A giant pulse of the Q-switched ruby laser was fired behind the reflected shock wave for initial pressure of 0.4mmHg in argon and for a shock velocity of 17 Mach.
    In the case of 90° scattering, assuming a plasma parameter α=0.85 theoretical curve accods very well with the measuredspectral distribution of the scattered light. The electron temperature and the electron density were determined to be 23, 000°K and 1.4 x 1016 cm-3, respectively.
    In the case of 450 scattering, the spectral distribution of the scattered light showed central peak and satellite peak. The wavelength shift of the satellite peak was 27Å. In this case a = 1.57, ne = 1.6 x 1016 cm-3 and Te= 26, 000°K were estimated. These values of the electron density and the electron temperature are in good agreement with the results of 90°scattering.
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  • Correlation of Density Fluctuations and Diffusion in a Plasma
    Takashige Tsukishima, C.K. McLane
    1966 Volume 18 Issue 1 Pages 21-48
    Published: 1966
    Released on J-STAGE: August 16, 2011
    DOIhttps://doi.org/10.1585/jspf1958.18.21
    JOURNAL FREE ACCESS
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