Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
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Volume 22, Issue 1
Displaying 1-5 of 5 articles from this issue
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  • A Study of Beam-Plasma Discharge (Part II)
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    1968 Volume 22 Issue 1 Pages 1-14
    Published: 1968
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.22.1
    JOURNAL FREE ACCESS
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  • J-Mirror, Magnetic Bottle Using the Longitudinal Invariant of Motion
    T. Ohkawa
    1968 Volume 22 Issue 1 Pages 15-21
    Published: 1968
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.22.15
    JOURNAL FREE ACCESS
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    A magnetic bottle may be obtained by having a maximum of longitudinal invariant (J) in both the radial and the axial direction. The “loss disc” in this case is the region in the velocity space corresponding to small parallel velocities or small values of the invariant. Since the excursion of the orbit with a small J is confined to a small volume, the collisions only in this volume will lead to the loss of the particle. Consequently, the confinement time limited by collisions is much longer than that of the.L.-mirror configuration. On the other hand, the constancy of J may be more readily destroyed by nonadiabaticity or low frequency electric field.
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  • A negative V″ wavy toroidal field with helical multipole II
    Kenro Miyamoto
    1968 Volume 22 Issue 1 Pages 22-29
    Published: 1968
    Released on J-STAGE: August 16, 2011
    DOIhttps://doi.org/10.1585/jspf1958.22.22
    JOURNAL FREE ACCESS
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    In the previous paper, the magnetic surface, V″ and the rotational transform angle of a wavy toroidal field with helical multipole are studied by analytecal approximation using a average method. In this paper these quanties are obtained by numerical computations and the results arrcompared with the analytical ones with good agreement. The case of 1=1 in this configuration is favorable to obtain larger rotational transform angle and it corn-es-ponds with a field of simple torus with off axis helical dipole field. The fatures of this confignrator are examined.
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  • On the Parametric Effects in the Propagation of Electron and Ion Waves
    Toshiro Ohnuma, Yoshisuke Hatta
    1968 Volume 22 Issue 1 Pages 30-37
    Published: 1968
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.22.30
    JOURNAL FREE ACCESS
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  • Problems in Lase-Interferometric Measurements and Improvements in Detection of Small Fringe Shift
    S. Takeda, A. Funahashi, A. Yasuda
    1968 Volume 22 Issue 1 Pages 38-48
    Published: 1968
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.22.38
    JOURNAL FREE ACCESS
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    Some problems in laser interferometric measurements are discussed. Improvements are described of the rtechnique, for detecting the small fringe shift, which was proposed by one of authors.
    A measurement is performed of the electron density in a decaying plasma by using an interferometer of a Ne-He laser, which works at the visible light of 0.63μ, . The plasma is produced in a 20 cm tube by a high-curent pulsed discharge· The fringe shift due to the decay of electron density is pbserved with two photomultipliers, which are located at. positionsaboUt 6m LtIA.18, y from the discharge tube. The two signals from he proemultipliers, are '.dif_ferentially amplified to eliminate the effect of lights from the discharge tube and garp switch, The minimum electron : density detected. in the vresent-re-Dort is. 9 x1013cm-3.for the plasma length. of 20cm. The value corresponds to about a 1/200 fringe. The decaycurve of the electron density determined by the laser interfero meter usedhere reasonably, connects with that measured by the 70-GHz microwave transmission method. This fact shows that the present method detecting the small fringe shift has a sufficient reliability.
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