中国物理B ›› 2010, Vol. 19 ›› Issue (6): 65204-065204.doi: 10.1088/1674-1056/19/6/065204

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Simulation on effect of poloidal power spectrum on lower hybrid wave propagation

秦永亮, 丁伯江, 匡光力, 贾华, 张立智   

  1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
  • 收稿日期:2009-04-07 出版日期:2010-06-15 发布日期:2010-06-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos.~10575104 and 10875149) and by Dean Foundation of Hefei Institute of Physical Science, Chinese Academy of Sciences.

Simulation on effect of poloidal power spectrum on lower hybrid wave propagation

Qin Yong-Liang(秦永亮), Ding Bo-Jiang(丁伯江), Kuang Guang-Li(匡光力), Jia Hua(贾华), and Zhang Li-Zhi(张立智)   

  1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
  • Received:2009-04-07 Online:2010-06-15 Published:2010-06-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos.~10575104 and 10875149) and by Dean Foundation of Hefei Institute of Physical Science, Chinese Academy of Sciences.

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摘要： The coupling of lower hybrid wave to the plasma is a crucial issue for efficient current drive in tokamaks. This paper establishes a new coupling model which assumes the antenna to be a curved face and the plasma to be a cylinder. Power spectrum considering the coupling between wave-guides in both poloidal and toroidal direction is simply estimated and discussed. The effect of the poloidal wave vector on wave propagation, power deposition and driven current is also investigated with the help of lower hybrid current drive code. Results show that the poloidal wave vector affects the ray tracing, and also has effect on power deposition and driven current. The effect of the poloidal wave vector on power deposition and driven current profile depends on plasma parameters. Preliminary studies suggest that it seems possible to control the current profile by adjusting the poloidal phase difference between the waveguide in poloidal direction.

Abstract: The coupling of lower hybrid wave to the plasma is a crucial issue for efficient current drive in tokamaks. This paper establishes a new coupling model which assumes the antenna to be a curved face and the plasma to be a cylinder. Power spectrum considering the coupling between wave-guides in both poloidal and toroidal direction is simply estimated and discussed. The effect of the poloidal wave vector on wave propagation, power deposition and driven current is also investigated with the help of lower hybrid current drive code. Results show that the poloidal wave vector affects the ray tracing, and also has effect on power deposition and driven current. The effect of the poloidal wave vector on power deposition and driven current profile depends on plasma parameters. Preliminary studies suggest that it seems possible to control the current profile by adjusting the poloidal phase difference between the waveguide in poloidal direction.

Key words: simulation, lower hybrid wave, poloidal wave vector, wave coupling

中图分类号:  (Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))

  • 52.35.Hr
52.55.Fa (Tokamaks, spherical tokamaks) 52.40.Fd (Plasma interactions with antennas; plasma-filled waveguides) 52.55.Wq (Current drive; helicity injection) 52.65.Ww (Hybrid methods)