Kakuyūgō kenkyū
Online ISSN : 1884-9571
Print ISSN : 0451-2375
ISSN-L : 0451-2375
Volume 61, Issue 3
Displaying 1-4 of 4 articles from this issue
  • Takeo Nishitani, Shin-ichi Ishida
    1989 Volume 61 Issue 3 Pages 137-150
    Published: March 20, 1989
    Released on J-STAGE: March 04, 2011
    JOURNAL FREE ACCESS
    The marfe (Multifaced Asymmetric Radiation From the Edge) is a poloidally asymmetric radiation band localized near the inside midplane and is a common phenomenon among middle and large size tokamaks like Alcator-C, ASDEX, TFTR, JET, and JT-60. It can be explained as a radiative thermal instability in a peripheral plasma. This paper reviews the phenomenology and theoretical treatments of marfes. And outline of the related phenomena, detached plasma and IDC (Improved Divertor Confinement), are provided herein.
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  • Takashi Nakamura
    1989 Volume 61 Issue 3 Pages 151-163
    Published: March 20, 1989
    Released on J-STAGE: March 04, 2011
    JOURNAL FREE ACCESS
    Property of High Density Matter with density from 1g/cm3 to 1016g/cm3 is argued. Using the equation of state for high density matter, the equilibrium structure of high density star is discussed. There are two phases of high density stars. They are white dwarf and neutron star. Each has a maximum possible mass. The reason for the existence of the critical mass is simply explained.
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  • Kenro Miyamoto
    1989 Volume 61 Issue 3 Pages 164-169
    Published: March 20, 1989
    Released on J-STAGE: March 04, 2011
    JOURNAL FREE ACCESS
    MHD fluctuation level in RFP plasma is reduced from a simple model that MHD relaxation and sustainment of RFP configuration are caused by the reconnection of lines of magnetic field driven by (m=0, n=1) mode nonlinearly excited by multi m=1 internal kink modes. Then the lines of magnetic forces becomes stochastic by the MHD fluctuations and the energy transport of RFP plasma in such situation is studied.
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  • Hee Je Kim, Toshinori Kajiwara, Sumio Motoyama, Katsunori Muraoka, Mas ...
    1989 Volume 61 Issue 3 Pages 170-184
    Published: March 20, 1989
    Released on J-STAGE: March 04, 2011
    JOURNAL FREE ACCESS
    For measurements of atomic hydrogen density in the periphery region or hign temperature plasmas, laser fluorescence spectroscopy (LFS) by two-photon excitation (1s-3s, 3d) was developed.
    Based upon the theoretical estimates for laser source requirements, which indicated the laser energy and spectral width to be more than 10mJ (assuming the pulse duration of 10ns) and several tens of picometers around the wavelength of 205.1nm, respectively, the first Stokes generation in deuterium gas of ArF laser output was adopted and shown to have the necessary performance.
    Through the LFS experiment employing the laser source, the minimum detectable limit of atomic hydrogen, normalized by a laser power and an observing solid angle, was demonstrated to be 1x 1014 [m-3 · MW · sr], which is usually sufficient for the above purpose, and the accuracy of the density determination was shown to be within a factor 2.
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