Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
Volume 21, Issue 3
Displaying 1-4 of 4 articles from this issue
  • Kazuo Sato, Haruyuki Ohnishi, Hideo Murata, Shoichi Shiina, Tadashi Ma ...
    1968 Volume 21 Issue 3 Pages 121-130
    Published: 1968
    Released on J-STAGE: March 04, 2011
    JOURNAL FREE ACCESS
    Hard x rays emitted from the slow θ pinch were meastrred in order to clarify the acceleration mechanism of high energy electrons in the rising axially magnetic field.
    The conditions for the hard x ray emission were studied by varying the initial gas pressure, charging voltage and the capacity of condenser bank, or by using the various kinds of gases.
    There are some evidences that the electron acceleration is not due to the single particle induction mechanism.
    It was found that the hard x rays were mostly emitted from the central volume of the discharge tube rather than from the wall of the tube.
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  • Kenro Miyamoto, Shozo Kon, Junya Yamamoto, Shigeyuki Morimoto, Hiroshi ...
    1968 Volume 21 Issue 3 Pages 150-153
    Published: 1968
    Released on J-STAGE: August 16, 2011
    JOURNAL FREE ACCESS
    A method of using CO2 laser interferometer is described for the density measurement of intermediate region (the product of denstity n and plasma diameter d is around 1015 cm-2). Michelson type interferometer is adopted and one-tenth of fringe corresponds n x d≅1.05 x 1015 cm-2. Ge-Cu photoconductor cooled by liquid helium is used as a dector with fast time reponse. These are applied for the density measurement of plasma of BSG device8)9) and it is confirmed that this method is reliable and easy technique for the purpose.
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  • Noboru Hokkyo
    1968 Volume 21 Issue 3 Pages 157-167
    Published: 1968
    Released on J-STAGE: March 04, 2011
    JOURNAL FREE ACCESS
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  • Kiyoshi HAYASE, Kenro MIYAMOTO, Junji FUJITA, Taijiro UCHIDA
    1968 Volume 21 Issue 3 Pages 168-180
    Published: 1968
    Released on J-STAGE: March 04, 2011
    JOURNAL FREE ACCESS
    Spase and time resolved Mach-Zebnder interferometer is applied to study a slow theta pinch plasma. Methods of timing operations and experimental arrangements are described. The plasma is pinched in the third half cycle of discharge period. The interferogram shows that the peak electron density varies from about 1 x 1016 to 1 x 1017 cm-3 as the filling gas pressure is varied from 25 to 400 mtorr. The radial distribution of shell structure is observed when a small reverse bias field is added. The relaxation time of this field is longer at the lower gas pressure. In the pressure range of higher than 40 mtorr, a flute-type instability appears. But no drift motions are observed. Interferograms show various modes of instabilities. The loss rate of the total number of electrons is estimated and the result is in good agreement with a theoretical model of steady magnetohydrodynamic fluid.
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