Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
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Volume 38, Issue 4
Displaying 1-3 of 3 articles from this issue
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  • On a Possibility of Further Heating of a Tokamak Plasma by Microwave Injection
    Kiyohiko OKAZAKI, Kosuke OKAMOTO, Yuichi SAKAMOTO
    1977 Volume 38 Issue 4 Pages 454-464
    Published: 1977
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.38.454
    JOURNAL FREE ACCESS
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    A possibility of further heating of a Takamak plasma by means of microwave is estimated from the energy balance equations with rough assumptions. It is shown that the ion temperature is expected to rise with the electron temperature even when all the wave power is directly absorbed by the electrons, because energy relaxation time between electrons and ions becomes shorter as the plasma density increases. As an example of the numerical values in this framework of calculation, the ion temperature rises to about 4 keV from the initial value of 900 eV when 20 MW microwave-is injected to a plasma of 60 m3 volume at the density of 8 × 1013 cm-3 with the magnetic field of 5 T.
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  • Doppler profile of nonuniform plasmas and determination of ion temperature
    Masumi Sato
    1977 Volume 38 Issue 4 Pages 465-474
    Published: 1977
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.38.465
    JOURNAL FREE ACCESS
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    Doppler broadening of a spectral line emitted from inhomogeneous plasmas is studied for the cases of optically thin, axisymmetric plasma in local thermal equilibrium. The ion temperature within the plasma can be determined from edge on line profiles by means of Abel inversion only for the two spectral intensities, instead of the conventional method using the halfwidth. An example of the inversion is given by considering the hypothetical distribution of plasma ions, and errors in this process are also discussed.
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  • Estimation of Wavenumber Spectra of Fluctuations by Using Fixed Probes
    Naofumi Iwama, Takashige Tsukishima
    1977 Volume 38 Issue 4 Pages 475-488
    Published: 1977
    Released on J-STAGE: March 04, 2011
    DOIhttps://doi.org/10.1585/jspf1958.38.475
    JOURNAL FREE ACCESS
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    A spectral analysis technique is studied with respect to a stationary and homogeneous random field. The differential coefficients of the covariance function of the field, represented by an analytic signal, is related to its wavenumber spectrum moment. It is shown that the covariance function evaluated by using a pair of fixed probes with an appropriately small separation may provide good estimators of the mean wavenumber and the wavenumber spectral width. This method of measurement may be useful for the experimental study of plasma turbulence.
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