Journal of Plasma and Fusion Research
Print ISSN : 0918-7928
Volume 78, Issue 7
Displaying 1-12 of 12 articles from this issue
Rapid Communications
  • Masao OKAMOTO, Noriyoshi NAKAJIMA, Shinsuke SATAKE, Weixing WANG
    2002Volume 78Issue 7 Pages 611-612
    Published: 2002
    Released on J-STAGE: December 08, 2005
    JOURNAL FREE ACCESS
    The neoclassical radial electric fields in a tokamak are calculated for the shifted Maxwellian distribution function by using a δf Monte Carlo particle simulation code ”FORTEC-FSM”. The calculation results agree well with the analytical estimations. The present method will be useful for the determination of the neoclassical radial electric field in tokamak plasmas with input momentum or torque by, e.g., NBI heating.
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  • Naoko SAITO, Atsushi OGATA
    2002Volume 78Issue 7 Pages 613-614
    Published: 2002
    Released on J-STAGE: December 08, 2005
    JOURNAL FREE ACCESS
    A linac is proposed in which a laser first excites plasmons along the inner surface of a metallic acceleration tube. The potential of the plasmon oscillation then accelerates electron beams. It features small beam size and good conversion efficiency from laser intensity to acceleration gradient.
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Commentary
  • Kazuya HAMADA, Norikiyo KOIZUMI
    2002Volume 78Issue 7 Pages 616-624
    Published: 2002
    Released on J-STAGE: December 08, 2005
    JOURNAL FREE ACCESS
    In the design of the International Thermonuclear Experimental Reactor (ITER), a forced flow cooled, Cable-In-Conduit Conductor (CICC) is selected for its magnet system because of its superior performance in withstanding voltage (>10kV) and, more importantly, its mechanical stiffness against large electromagnetic forces. The CICC consists of about 1,000 superconducting strands enclosed in a steel jacket, and due to this configuration, the CICC exhibits a characteristic electromagnetic phenomena which can be a cause of the instability of a conductor. Extensive studies were performed, especially on ac losses, stability, and current imbalance among the strands in order to understand the phenomena and to provide a design basis for CICC to be used in large superconducting magnets. This paper describes the work on developing the CICC including analytic studies regarding the realization of fusion magnets.
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Special Topic Article : Ultra-Sensitive Elemental Analysis Using Plasmas
Lecture Note : Relativistic Plasma Physics
  • Masahiro HOSHINO
    2002Volume 78Issue 7 Pages 668-677
    Published: 2002
    Released on J-STAGE: December 08, 2005
    JOURNAL FREE ACCESS
    The origin of high energy particles seen radiating in astrophysical synchrotron sources is still a major unresolved problem in high-energy and plasma as trophysics. The diffusive/Fermi shock acceleration under turbulent fields has been discussed as one of important processes in the production of the high-energy particles, but alternative mechanisms that can accelerate particles in a short time scale have been recently discussed as efficient non-thermal particle acceleration mechanisms. First we review the standard diffusive/Fermi acceleration, and then discuss new ideas involving the direct/fast acceleration mechanisms of the magnetic reconnection and the electron shock surfing process.
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  • Shiho KOBAYASHI
    2002Volume 78Issue 7 Pages 678-684
    Published: 2002
    Released on J-STAGE: December 08, 2005
    JOURNAL FREE ACCESS
    Gamma-raybursts (GRBs) are the most explosive events after the big bang. For a few seconds a GRB be comes the brightest object in the Universe, overshining the rest of the Universe combined. Clearly this reflects extreme conditions that are fascinating and worth exploring. GRB observations were recently revolutionised by the discovery of the delayed X-ray emission, called ”afterglow”. These observations revealed that the deceleration of relativistically expanding fireballs causes GRBs. I discuss special relativistic effects that play an important role in the fireball model.
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Contributed Paper
  • Kunihiro SATO, Hideaki KATAYAMA
    2002Volume 78Issue 7 Pages 685-690
    Published: 2002
    Released on J-STAGE: December 08, 2005
    JOURNAL FREE ACCESS
    The distribution function of the reacting particles' center of gravity isderived in order to determine the energy distribution of particles produced by fusion reaction. It is shown that the distribution function of the reacting particles' center of gravity becomes a Maxwellian distribution regardless of energy dependence of the reaction cross section when two Maxwellian distributions of fuel particles interact. The 14.7 MeV protons produced by D³He reaction have an energy spread of about 2 MeV due to the thermal motion of the center of gravity. About 90 % of the kinetic energy of the fusion protons can be converted into electricity if a one-stagedirect-current direct energy converter is used to recover the protons' kinetic energy.
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