Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
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Volume 11, Issue 2
Displaying 1-4 of 4 articles from this issue
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  • Response of a partially ionized drifting plasma to temperature perturbation
    Takayoshi Okuda, Kenzo Yamamoto
    1963 Volume 11 Issue 2 Pages 146-178
    Published: 1963
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.11.146
    JOURNAL FREE ACCESS
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    In the present paper, impedance formulae for partially ionized plasma are derived on the basis of the transport equation, involving temperature perturbation. In the first attempt, the density perturbation is completly neglected but the inertia term is retained. The second is based on the ignorance of all space derivatives of the density, velocity and temperature. The third attempt is made with use of the quasisteady approximation, but without exception of the term related to the space charge field.
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  • The construction of magnetically driven fast acting valve
    Keiichi Hirano
    1963 Volume 11 Issue 2 Pages 179-190
    Published: 1963
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.11.179
    JOURNAL FREE ACCESS
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    A magnetically driven fast acting valve is constructed for our cusp experiment.
    Some of the valve performance charactristics are oftained, which agree closely with theoretical estimation.
    Maximum flight velocity of the valve is observed to be 10m/sec, when the condenser is charged 10 KV.
    Valve-opening durations of 0.1 m. sec. to 0.9 m sec are obtained.
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  • MAGNETIC COMPRESSION OF TOROIDAL PLASMA PART (I)
    Tadashi KAWAI, Hiromichi KONDO, Moriyuki SUGIMOTO, Masatami IWAMOTO, K ...
    1963 Volume 11 Issue 2 Pages 191-221
    Published: 1963
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.11.191
    JOURNAL FREE ACCESS
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    The possibility of confining the plasma in a toroidal shape by means of axial magnetic field of high rate of rise has been examined in our laboratory. The plasma column was pre-heated with the induced axial current by' ohmic heating' before it is adiabatically compressed. The glass torus of 600 m/m, major and 120 mm minor diameters was used. The plasma machine was most carefully designed to provide high degree of uniformity of the electromagnetic field in the torus. The plasma of air and He was constricted to about 1/3 of the torus inner diameter, around the center axis for 10 to 20 μS, and after that the drift of the column due to the charge separation was observed to drive it toward the wall. The temperature was estimated from the plasma conductivity to attain as high as 100, 000 to 200, 000oK. Magnetic probe and spectroscopic disgnostics have also been applied.
    In part I, Discussions on the designing considerations about the plasma machine and the results of electrical measurements with streak photographs of the plasma appearance are given. The results of magnetic probe measurements and the spectroscopic investigations are now being prepared for publication and will be reported in part II.
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  • A model of Anomalous Relaxation of Electrons in Disturbed Plasmas
    N. Hokkyo
    1963 Volume 11 Issue 2 Pages 222-227
    Published: 1963
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.11.222
    JOURNAL FREE ACCESS
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    A new mechanism is suggested for the anomalous relaxation of electrons in a disturbed plasma in which velocity distribution function of electrons fluctuates around some smooth function. The analysis of the Nyguist diagram, which is a plotas a function of ω/k of real and imaginary parts of w= (ω2p/k2) ε (k, ω), where ε (k, ω) is the dielectric constant, shows that as we go to smaller k values the diagram crosses the origin of the complex w-plane (zeros of ε (k, ω) at a number of points, each crossing gioing a possible value of ω/k and hence the dispersion relation for a possible wave mode in the medium. That these modes have acoustic type dispersion relation is easily seen by the observation of the diagram.
    The energy loss of a fast electron incident on our disturbed plasma will be greatly increased due to excitation of these extra modes, arising from the fluctuation, in addition to the usual loss associated with plasmon excitation. The fluctuation in the velocity distribution function may be due, either to external causes, or to runaway electrons on some other cooperative phenomena in the medium.
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