中国物理B ›› 2010, Vol. 19 ›› Issue (9): 95202-095202.doi: 10.1088/1674-1056/19/9/095202

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Discrete Alfvén eigenmodes in international thermonuclear experimental reactor operations with negative magnetic shear

王军, 胡双辉, 代清平, 姚龙宝   

  1. College of Science, Guizhou University, Guiyang 550025, China
  • 收稿日期:2009-12-18 修回日期:2010-02-19 出版日期:2010-09-15 发布日期:2010-09-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 10675037).

Discrete Alfvén eigenmodes in international thermonuclear experimental reactor operations with negative magnetic shear

Wang Jun(王军)†, Hu Shuang-Hui(胡双辉)‡, Dai Qing-Ping(代清平)a), and Yao Long-Bao(姚龙宝)   

  1. College of Science, Guizhou University, Guiyang 550025, China
  • Received:2009-12-18 Revised:2010-02-19 Online:2010-09-15 Published:2010-09-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 10675037).

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摘要： Discrete Alfvén eigenmodes in steady-state operation scenarios with negative magnetic shear in the international thermonuclear experimental reactor are investigated in this paper. These magnetohydrodynamic eigenmodes are trapped by the α -induced potential wells along the magnetic field line. Here α =-q2Rdβ/d r with q being the safety factor, β the ratio between plasma and magnetic pressures, and R the major radius, and r the minor radius. Due to negligible continuum damping via wave energy tunneling, these Alfvén eigenmodes could be readily destabilized by energetic particles.

Abstract: Discrete Alfvén eigenmodes in steady-state operation scenarios with negative magnetic shear in the international thermonuclear experimental reactor are investigated in this paper. These magnetohydrodynamic eigenmodes are trapped by the $\alpha$ -induced potential wells along the magnetic field line. Here $\alpha=-q^2R{\rm d}\beta/{\rm d}r$ with q being the safety factor, $\beta$ the ratio between plasma and magnetic pressures, and R the major radius, and r the minor radius. Due to negligible continuum damping via wave energy tunneling, these Alfvén eigenmodes could be readily destabilized by energetic particles.

Key words: Alfvén eigenmodes, negative magnetic shear, magnetohydrodynamic instability

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  • 5235B