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Volume 56 (1986)
- Issue 6 Pages 369-
- Issue 5 Pages 305-
- Issue 4 Pages 235-
- Issue 3 Pages 169-
- Issue 2 Pages 81-
- Issue 1 Pages 5-
Volume 56, Issue 2
Displaying 1-5 of 5 articles from this issue
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Kazuo Odajima1986 Volume 56 Issue 2 Pages 81-95
Published: August 20, 1986
Released on J-STAGE: August 16, 2011
JOURNAL FREE ACCESSConfinement characteristics of additionally heated plasma are shown from both aspect of gross energy confinement time and total stored energy. Until now, the former aspect has been precisely discussed but the latter has been scarcely. The latter aspect shows us very novel features such that the incremental stored energy by the additional heating has its own energy confinement time which is independent of additional heating power, plasma current and density. Parameter dependence of scaling, improved confinement such as H-mode and phenomena of “profile consistency” are discussed on the point of view of stored energy.View full abstractDownload PDF (1496K) -
In-Vessel MaterialsMichio Yamawaki1986 Volume 56 Issue 2 Pages 96-104
Published: August 20, 1986
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSChemical sputtering and radiation-enhanced sublimation of graphite have been the subject of many intense researches. Chemical form of desorbing species and synergism between thermal atoms and energetic atoms are among the controversial problems of surface erosion of graphite. Self-sustaining surface segregated low-Z layers have been proposed as a new approach to impurity control. Hydrogen isotope dynamics between plasma and first wall is very important in controlling the plasma, and hence the fusion reactor itself. In this sense, surface recombination coefficient of hydrogen must be evaluated for various materials with various surface conditions. Its theory and surface impurity effect are described.View full abstractDownload PDF (849K) -
Kenzo Miya1986 Volume 56 Issue 2 Pages 105-114
Published: August 20, 1986
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSFundamentals and application of superconducting magnet of a fusion reactor are stated. Regarding to a design of the magnet, thermomechanical aspect is referred to in terms of quench phenomena. A relation between stored magnetic energy and mass required to support electromagnetic force is discussed for the superconducting magnets.View full abstractDownload PDF (916K) -
Zensho Yoshida1986 Volume 56 Issue 2 Pages 115-123
Published: August 20, 1986
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSThe dissipative structure of an MHD system is studied theoretically and phenomenologically. General remarks are made on the relation between self-organization in dynamical systems and characteristics of equilibria. We introduce a concept of quasi-ultimate states, and find MHD quasi-ultimate states, which correspond to RFP, tokamak, and trivial states. An extended set of stable equilibria, that is the quasistatic class of equilibria, includes ULQ states which are lying between the tokamak and RFP states. Relaxation into these stable equilibria is characterized by two different processes, viz., classical diffusion and MHD relaxation.View full abstractDownload PDF (959K) -
Takemasa Shibata, Hiroshi Horiike, Shinzaburo Matsuda, Yoshihiro Ohara ...1986 Volume 56 Issue 2 Pages 124-133
Published: August 20, 1986
Released on J-STAGE: March 04, 2011
JOURNAL FREE ACCESSA negative-ion-based neutral beam injector is designed conceptually for Fusion Engineering Reactor (FER). The injector is characterized by a long, slender beamline, which is 0.3-0.4m wide, 40m long, supplying 500keV, 20MW neutral beams into the tokamak. Beam divergence is 0.3 degree and such a low divergence is considered to be attainable by using a volume D-ion source because the divergence of 0.8-0.9 degree was obtained in our recent experimental results in spite of the low beam energy of 25keV. Tangential beam injection is possible in this design because of high beam energy and a narrow drift duct. Maintenance of the injector will be easy since beamline components installed near the tokamak are small and simple, and complicated beamline components such as the ion source are situated far from the tokamak.View full abstractDownload PDF (936K)
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