Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
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Volume 23, Issue 6
Displaying 1-3 of 3 articles from this issue
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  • Anomalous Skin Effect of Microwaves incident on Magneto-plasmas
    K. Minami, S. Takeda
    1969 Volume 23 Issue 6 Pages 322-345
    Published: 1969
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.23.322
    JOURNAL FREE ACCESS
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  • Analysis of the Linear Helical Heliotron Field
    Shinzaburo MATSUDA, Akihiro MOHRI
    1969 Volume 23 Issue 6 Pages 346-366
    Published: 1969
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.23.346
    JOURNAL FREE ACCESS
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    An average minimum magnetic field with inner conductors for plasma confinement can be generated when current carrying helical conductors are placed in a uniform magnetic field. The helical currents are axially uni-directional and the axial field component produced by the currents is inverse to the uniform field near the axis. Inside the conductors, this axial component diminishes the uniform field, so that an average minimum field can be realized.
    This magnetic field has both properties of multipole field and the Heliotron P field (multi-ring system+uniform field). When the pitch of the helical conductors is large compared with its radius, the properties of the multipolr field dominates, whereas the field with short pitch is like the Heliotron P field. The magnetic field is examined for linear configurations The helical currents are expressed by the Fourier expansion, and potentials U=-∫ dl/B and-∫ dl are computed by a digital computer. The ratio of the helical field on the axis to the uniform field is used as a parameter of the field configuration. It becomes evident that at appropriate values of the parameter closed magnetic surfaces appear near the axis and very deep potential wells are formed. The rotational transform is also very large.
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  • Heating in low density θ-pinch plasma
    S. Shiina, H. Ohnishi, T. Suzuki
    1969 Volume 23 Issue 6 Pages 367-381
    Published: 1969
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.23.367
    JOURNAL FREE ACCESS
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    The heating of θ-pinch plasma produced by 18 KJ fast condensor bank was investigated at the caner stage in the increasing magnetic field. The electron temperature was determined from the absorption method of soft X-rays at initial pressures of 10-200 mTorr D2. The time histories of neutron, visible light and hard X-ray's emissions were also observed. The soft X-ray measurements showed the higher (several KeV) and the lower (-102 eV) electron temperatures. The higher electron temperature can be observed in the condition that the plasma densities are within the extremly low region, which has the lower and the upper limits. The neutron detector showed the more intense signal in the plasma with the higher electron temperature than in the lower elctron temperature, in spite of the lower density.
    The production of such higher temperature plasma can be considered as an dissipative phenomenon in the collisionless plasma, which may result from an microinstability, for in stance, the electron-ion two streaming instability refered to the θ-pinch configration.
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