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Volume 68 (1992)
- Issue 6 Pages 549-
- Issue 5 Pages 467-
- Issue 4 Pages 360-
- Issue 3 Pages 226-
- Issue 2 Pages 101-
- Issue 1 Pages 6-
Volume 68, Issue 3
Displaying 1-5 of 5 articles from this issue
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Masakatsu Murakami1992 Volume 68 Issue 3 Pages 226-248
Published: September 25, 1992
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSHohlraum physics for heavy ion fusion is reviewed.The beam/x-ray conversion, radiation confinement, and indirectly driven implosion are studied both analytically and numerically.As a result, x-ray conversion efficiencies more than 80% under deposition powers in the order of 1016W/g, radiative transfer efficiencies between 30% and 50%, hydrodynamic efficiencies of up to 20% are obtained.Overall coupling efficiencies in the range of 5-10% seem to be possible.Results concerning target gain are given. Also the mechanism of radiation symmetrization is shown systematically.View full abstractDownload PDF (2105K) -
Eisuke Tada, Kiyoshi Yoshida, Kiyoshi Shibanuma, Masato Akiba, Yoshika ...1992 Volume 68 Issue 3 Pages 249-267
Published: September 25, 1992
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSFusion Experimental Reactors are one of the major steps toward realization of fusion energy production by commercial reactors.The key objectives of experimental reactors are to demonstrate the scientific and technological feasibility prior to construction of the DEMO Fusion Reactor. ITER (International Thermonuclear Experimental Reactor) is one of the experimental reactors, and its conceptual design has been completed by the united efforts of the USA, USSR, EC and Japan.In parallel with the conceptual design, key technology developments in various areas have been conducted.Based on these achievements, the Engineering Design Activity (EDA) is being initiated and will include development, manufacturing and testing of scalable modeles to demonstrate engineering feasibility.
This paper describes the latest progress in the development of technology for tokamak basic devices such as superconducting magnets, remote handling of in-vessel components, plasma facing components, and neutral beam injection systems.View full abstractDownload PDF (7106K) -
Sadao Masamune, Yoichi Hirano1992 Volume 68 Issue 3 Pages 268-278
Published: September 25, 1992
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSSetting up of a reversed field pinch (RFP) configuration and subsequet sustainment of the configuration are regarded as an example of self-organization in high-temperature plasmas. Dynamic process of the self-organization in RFP's is discussed based on experimental results. Time evolution of the poloidal and toroidal mode numbers has revealed that nonlinear coupling of m=1 resistive internal kink modes plays essential roles in both setting up and sustainment phase of the RFP configuration.The nonlinear coupling of the kink modes may also be related to early termination of the discharge, as well as to relaxation, transport and confinement.Further efforts are required for the quantitative comparative discussion of the theory and experiments.View full abstractDownload PDF (1147K) -
Masaaki Nagatsu, Yuichi Tsubouchi, Noriharu Takada, Koichi Sasaki, Tak ...1992 Volume 68 Issue 3 Pages 279-297
Published: September 25, 1992
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSComputer simulation has been carried out with the Monte Carlo method to assess the accuracy of ion temperature measurement by means of the collective Thomson scattering for the Heliotron E using a high power, multi-mode D2O laser.Knowing the fine spectral structure of a pulsed D2O laser emission which has been simultaneously measured using a highly frequency-resolved heterodyne detection system, we can evaluate the ion temperature with almost the same accuracy as that obtained in the conventional single-mode laser scattering.View full abstractDownload PDF (1609K) -
Tsuguhiro Watanabe, Tadatsugu Hatori, Akira Ishida1992 Volume 68 Issue 3 Pages 298-327
Published: September 25, 1992
Released on J-STAGE: October 22, 2010
JOURNAL FREE ACCESSThe drift orbit of high energy ions under the magnetic configuration of the Large Helical Device (LHD) is pursued numerically with high accuracy and for many hours. The particle confinement characteristics of LHD is studied systematically.
Particle orbits are divided roughly into five groups by the value of an initial position and pitch angle of the particles. Three groups in these form closed drift surface in their Poincare map of the orbit, and are confined perfectly in the magnetic field in case of no collisions. Another groups, which can not form closed drift surface, are composed of chaos orbit group and direct loss orbit group.
Chaos orbit group is confined relatively long intervals in the magnetic field. Direct loss orbit group is lost immediately from magnetic field because magnetic field plays no role for particle confinement. Positions of lost particle are compared with divertor chart of lines of force.
The phase space of particles is roughly divided into three regions: drift surface formation regions, chaos zones and direct loss regions, according to the type of orbit.
Particles in the chaos regions and reflecting particles in the closed drift surface formation regions are flitting about between deep magnetic surface regions and chaotic lines of force regions outside of most outside of magnetic surface.View full abstractDownload PDF (3731K)
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