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Volume 64, Issue 1
Displaying 1-5 of 5 articles from this issue
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Japanese Contribution to the Japan-US CollaborationKazutaka Kawamura, Kenji Sumita1990 Volume 64 Issue 1 Pages 5-31
Published: July 20, 1990
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSAlthough the 14 MeV-neutron irradiation have been terminated with the end of March, 1987, some japanese scientists participated in Japan-US collaboration on RTNS- II utilizationhave still worked on various post-irradiation tests for irradiated specimens. The present paperdescribes the results obtained for the period from 1982 to 1989. Much emphases are on themicrostructure evolution and the mechanical property change for various structural materialsand on the degradation of electronic performance parameters for various diagnostic devices by14 MeV neutron irradiation, in addiation to the neutronics and the in-situ tritium recovery.View full abstractDownload PDF (3157K) -
Nobuaki Noda, Akira Miyahara1990 Volume 64 Issue 1 Pages 32-44
Published: July 20, 1990
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSTEXTOR tokamak experiments were operated since 1983 and a toroidal pump limiter ALT-II (Advanced LimiterTest II) was installed in 1986. Main topics of the international collaboration on TEXTOR and present status of TEXTOR are reviewed for the period of 1983-1990.View full abstractDownload PDF (1728K) -
Michio Yamawaki, Kenji Yamaguchi1990 Volume 64 Issue 1 Pages 45-57
Published: July 20, 1990
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSHydrogen isotopes transport properties of first wall candidate materials, both metallicand ceramic, have been widely investigated. In the case of such metals as nickel, vanadium orstainless steel, the observed hydrogen permeation behaviors can be intimately correlated withthe surface impurity compositions. The impurities such as sulfur and oxygen were found tosignificantly reduce hydrogen recombination rate at the surface. On the other hand, as forgraphite and other carbon materials, the hydrogen permeation rate depends on the porestructure, namely, the pore size and its distribution, as well as the tortuosity.View full abstractDownload PDF (1774K) -
Zensho Yoshida1990 Volume 64 Issue 1 Pages 58-70
Published: July 20, 1990
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSAn excess of magnetic energy is spontaneously released through MHD relaxation process. The released energy is dissipated by the ions and electrons. Using the classical resistivity andviscosity coefficients, the partition relation of the dissipated power into the electrons and ionshas been estimated. In a driven reconnection, where the growth rate of the instability is quitelarge, a slight compressibility of the velocity field results in strong viscous heating of the ions.Concerning the total energy balance, there exists an anomalous resistive dissipation throughmean-field current, when the resistivity distribution is not uniform. This is a counter processto the direct heating of the ions, which implies a direct loss channel for the applied energy throuirh the electrons.View full abstractDownload PDF (1337K) -
Yoshio Tsuji1990 Volume 64 Issue 1 Pages 71-77
Published: July 20, 1990
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSIn comparing nuclear fusion in plasma by the magnetic confinement with nuclear fission andchemical reactions, the power density and the function of a heat engine are discussed using a newparameter G introduced as an eigenvalue of a reaction and the value of q introduced to estimate thethermal efficiency of a heat engine. It is shown that the fusion reactor by the magnetic confinementis very difficult to be a modern heat engine because of the lack of some indispensable functions as amodern heat engine. The value of G and q have the important role in the consideration.View full abstractDownload PDF (1121K)
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