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2011 Fiscal Year Final Research Report

Analysis of ripple resonance diffusion of alpha particles in burning plasma

Research Project

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Project/Area Number 21560856
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionTokyo Institute of Technology

Principal Investigator

TSUTSUI Hiroaki  東京工業大学, 原子炉工学研究所, 助教 (20227440)

Co-Investigator(Kenkyū-buntansha) TSUJI-IIO Shunji  東京工業大学, 原子炉工学研究所, 准教授 (90272723)
SHIMADA Ryuichi  東京工業大学, 原子炉工学研究所, 教授 (40206181)
Project Period (FY) 2009 – 2011
Keywordsプラズマ・核融合 / 計算物理 / シミュレーション工学 / 数理物理 / 確率論
Research Abstract

The confinement of alpha particles is important in tokamak systems. Guiding center equations which ignores Larmor radius are used in order to evaluate alpha-particles orbits, while the equations are not valid for spherical tokamaks in which the characteristic length of variation of magnetic field is not negligible compared with Larmor radius. Although these differences, which are finite Larmor radius effects, appear as locations of banana tips, the differences are quantitative, not qualitative. Next we analyzed the ripple-resonance diffusion, which are caused by the resonance of banana-particle motions and magnetic field ripples, numerically and theoretically. The diffusion coefficients are enhanced around the ripple resonance energy while they are not so much enhanced in the neighborhood of it. Consequently, they have a local minimum near the resonance energy, and hence they have an M-shaped energy dependence. Ripple resonance is caused by a radial change of the toroidal precession of banana particles, and creates islands in a phase space.

  • Research Products

    (6 results)

All 2012 2011 2010 2009 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (3 results) Remarks (1 results)

  • [Journal Article] Effects of ELM mitigation coils on energetic particle confinement in ITER steady-state operation2012

    • Author(s)
      K. Tani, K. Shinohara, T. Oikawa, H. Tsutsui, S. Miyamoto, Y. Kusama, T. Sugie
    • Journal Title

      Nucl. Fusion

      Volume: 52 Pages: 013012

    • Peer Reviewed
  • [Journal Article] Numerical Study of the Ripple Resonance Diffusion of Alpha Particles in Tokamaks2009

    • Author(s)
      Hideyuki MIMATA, Keiji TANI1, HiroakiTSUTSUI, Kenji TOBITA, Shunji TSUJI-IIO, Ryuichi SHIMADA
    • Journal Title

      Plasma and Fusion Research

      Volume: 4 Pages: 008

    • Peer Reviewed
  • [Presentation] Finite larmor radius effect in ripple resonance diffusion of alphaparticles in tokamaks2011

    • Author(s)
      H. Tsutsui, S. Tsuji-Iio, R. Shimada, K. Tani
    • Organizer
      PLASMA2011
    • Place of Presentation
      Kanazawa
    • Year and Date
      2011-11-23
  • [Presentation] Physical mechanism of ripple resonance diffusion of alphaparticles in tokamaks2010

    • Author(s)
      H. Tsutsui, H. Mimata, S. Tsuji-Iio, R. Shimada, K. Tani
    • Organizer
      37th EPS Conference on Plasma Physics
    • Place of Presentation
      Dublin
    • Year and Date
      2010-06-21
  • [Presentation] トカマクにおけるリップル共鳴拡散とその物理機構の解明2009

    • Author(s)
      筒井広明、三又秀行,飯尾俊二,嶋田隆一,谷啓二
    • Organizer
      プラズマ・核融合学会第26回年会
    • Place of Presentation
      京都市国際交流会館
    • Year and Date
      2009-12-01
  • [Remarks]

    • URL

      http://www.nr.titech.ac.jp/~htsutsui/

URL: 

Published: 2013-07-31  

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