Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
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Volume 10, Issue 6
Displaying 1-4 of 4 articles from this issue
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  • [title in Japanese]
    K Husimi, N. Yajima, T. Tsuzuki
    1963 Volume 10 Issue 6 Pages 442-462
    Published: 1963
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.10.442
    JOURNAL FREE ACCESS
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  • Gravitational Instability in a Plasma in a Magnetic Field
    III. Particle Aspec
    Ichiro Kawakami, Masatomo Sato
    1963 Volume 10 Issue 6 Pages 463-491
    Published: 1963
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.10.463
    JOURNAL FREE ACCESS
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    The instability of a plane boundary of plasma supported under, gravity by a magnetic field is investigated in the first order orbit theory taking into account the collisions between particles, where the collision frequency is assumed small as compared with the Larmor frequency. It is demonstrated that the instability growth rate may be suppressed by collisions of Gravitational Instability in a Plasma in a Magnetic Field ions with neutral particles (for a weakly ionized plasma) or among themselves (for a fully ionized plasma). The physical mechanism of the stabilization is the “discharge” of surface charges as a result of the collisional drift motion of ions which takes place across the magnetic field in the direction of the produced electric field. A non-linear effect is also discussed within the validity of the surface charge.
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  • Motion of Charged Particles in Cusped Geometry
    [in Japanese], [in Japanese]
    1963 Volume 10 Issue 6 Pages 492-513
    Published: 1963
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.10.492
    JOURNAL FREE ACCESS
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    Behaviors of charged particles injected from the entrance cusp are studied using Norton's field. Regions in which the orbits of particles exist are easily determined using various initial conditions at cusp throat. Detailed loci of particles have been obtained using an electronic computer “NEAC 2203”. Orbits near at point and line cuspo been worked out approximately and these agree closely with the calculated ones.
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  • Analysis of Pulse Probe
    [in Japanese]
    1963 Volume 10 Issue 6 Pages 514-526
    Published: 1963
    Released on J-STAGE: August 16, 2011
    DOIhttps://doi.org/10.1585/jspf1958.10.514
    JOURNAL FREE ACCESS
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    A cuurent response of a Langmuir probe is analyzed theoretically when a step-wise voltage of a small amplitude is applied to the probe. The analysis is based on the linearized Bolt zman-Vlasov equations for electrons and ions, including collision terms, and Poisson's equation, to which Fourie-Laplace transformations are applied with an initial condition that the energy distribution is Maxwellian befor the step voltage δVo is applied. The external electric field due to the presence of the finite probe potential is assumed to have a form as Eext (x, t) =- (δV/L) ·D (x), where δV is zero for t<0 and δVo for t≥0, L is a constant representing an effective penetration depth of the external field and D (x) is a function of x. The collision frequencies are assumed to be independent of the energies of the charged particles. The effect of Landau damping is taken into considerations. It is shown that, for an electron plasma, the current flowing into the probe is given approximately by δj (O, t) = δjo.e-νt sinωpt, where δjo is a constant proportional to δVo/L and the electron density, v and ωp are the collision frequency and the plasma frequency respectively. A discussion is also made on the current response for an electron-ion plasma.
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