Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
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Volume 6, Issue 2
Displaying 1-7 of 7 articles from this issue
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  • Radiation by Collective Interaction
    N. Hokko
    1961 Volume 6 Issue 2 Pages 69-78
    Published: 1961
    Released on J-STAGE: March 23, 2011
    DOIhttps://doi.org/10.1585/jspf1958.6.69
    JOURNAL FREE ACCESS
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    The bremsstrahlung of an electron passing through a plasma under the cumulative influences of long range coulomb forces excerted by many other electrons in the medium is. considered. In this process, the medium exchanges a definite amount of momentum and energy with the radiating electron in the form, of a plasmon. The differential cross section is obtained for the process in which a photon is emitted in a given direction and energy while the radiating electron is deflected through a given angle after exciting or absorbing a plasmon. The processes may also be looked upon as the plasmon emission or absorption processes by anomalous Doppler effect if one imagines a moving 'atom' consisting of an electron and a plasmon. The radiation condition, which is the extension of the usual Cerencov condition in the plasma, is found to be |c/nυ±ωp/kυ+ (kp/k) Cosθp|≤1, where υ is the velbcity of the electron, n the refractive index, k the wave number of the emitted photon, (ωp, kp) the plasmon frequency and the wave number, and θp=υkp, the upper signs referring to the plasmon emission and the lower to the plasmon absorption.
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  • Confinement of a semi-infinite plasma by a travelling magnetic field
    Y. Mimura, M. Hashikuni
    1961 Volume 6 Issue 2 Pages 79-95
    Published: 1961
    Released on J-STAGE: March 23, 2011
    DOIhttps://doi.org/10.1585/jspf1958.6.79
    JOURNAL FREE ACCESS
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    When the sinusoidal magnetic field is applied on the semi-infinite plasma parallel to the surface of it and the field travels in the direction parallel to the surface of the plasma and perpendicular to the direction of the field, the diffused field in the plasma draws the latter and eliminates the effect of the travelling field on the confinement of the plasma. The life-time of the plasma confinement is estimated and it is shown that the common treatment to put the conductivity of the plasma infinite is misleading.
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  • NOTES ON ADIABATIC THEOREM
    Yoiti WATANABE
    1961 Volume 6 Issue 2 Pages 96-125
    Published: 1961
    Released on J-STAGE: March 23, 2011
    DOIhttps://doi.org/10.1585/jspf1958.6.96
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    Asymptotic behavious of adiabatic invariants are discussed. Strictly speaking, the invariance is defined by the aid of the concept of all order invariance in the stationary region. It is extended into unstationary regions, whereupon there are two situations, one of which yields the increment of the quantity less than the order of λ-2, and the other that of the order of λ-1.Koopman-v. Neumann's method of Hilbert space of classical dynamics is a good tool for our analysis, and that yields physical meanings of the terms of asymptotic series analogously to quatum mechanical words. Symmetry of the said system has a certain role of adiabatic invariance, This suggests a kinematical situation of C.G.L. gas distribution.
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  • The Scattering of Microwaves by a Plasma Cylinder.II
    Y. Midzuno
    1961 Volume 6 Issue 2 Pages 126-136
    Published: 1961
    Released on J-STAGE: March 23, 2011
    DOIhttps://doi.org/10.1585/jspf1958.6.126
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  • The boundary layer of plasma I
    The case of Static plasma
    K. Hushimi, N. Yajima, T. Tsuzuki
    1961 Volume 6 Issue 2 Pages 137-159
    Published: 1961
    Released on J-STAGE: March 23, 2011
    DOIhttps://doi.org/10.1585/jspf1958.6.137
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    1961 Volume 6 Issue 2 Pages 160-201
    Published: 1961
    Released on J-STAGE: March 23, 2011
    DOIhttps://doi.org/10.1585/jspf1958.6.160
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    In the course of developing a new type of particle detector utilizing a gas discharge phenomenon in a pulsed microwave field, some characteristic features of the discharge have been studied.
    A theoretical analysis has been done as for the possibility to produce a localized plasma as small as about one cubic millimeter, and luminous enough for photography, because of the necessity of obtaining a thin and bright track as a particle detector.
    The experimental results show a fairly good agreement with the predicted values; the electron density of the order of about 1014/C. C. has been obtained in the localized plasma under a pulsed microwave field of 5000MC/S, 0.1μs width and 3kv/cm of the field strength, applied to a gas mixture of 500mmHg of Neon and a small percent Argon.
    The mechanisum of the recovery processes of the discharge is also discussed with particular attention to the after-glow due probably to recombination processes.
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  • Coulomb interaction in magneto-plasma
    K. Kitao, W. Watari
    1961 Volume 6 Issue 2 Pages 202-213
    Published: 1961
    Released on J-STAGE: March 23, 2011
    DOIhttps://doi.org/10.1585/jspf1958.6.202
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