中国物理B ›› 2006, Vol. 15 ›› Issue (3): 593-599.doi: 10.1088/1009-1963/15/3/025

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Tomographic analysis of the central magnetohydrodynamic oscillations on the HT-7 tokamak

阮怀林1, 马天鹏2, 胡立群2, 万宝年2, 高翔2, 甄香君2, 周立武2, 孙有文2, 高伟2, 陈忠勇2, 林士耀2, 孔伟2   

  1. (1)Institute of Electronic Engineering, Hefei 230037,China; (2)Institute of Plasma Physics, Chinese Academy of Science,Hefei 230031,China
  • 收稿日期:2005-07-01 修回日期:2005-08-26 出版日期:2006-03-20 发布日期:2006-03-20
  • 基金资助:
    Project Supported by the National Natural Science Foundation of China (Grant Nos 10375070 and 10305012).

Tomographic analysis of the central magnetohydrodynamic oscillations on the HT-7 tokamak

Ma Tian-Peng (马天鹏)a, Ruan Huai-Lin (阮怀林)b, Hu Li-Qun (胡立群)a, Wan Bao-Nian (万宝年)a, Gao Xiang (高翔)a, Zhen Xiang-Jun (甄香君)a, Zhou Li-Wu (周立武)a, Sun You-Wen (孙有文)a, Gao Wei (高伟)a, Chen Zhong-Yong (陈忠勇)a, Lin Shi-Yao (林士耀)a, Kong Wei (孔伟)a   

  1. a Institute of Plasma Physics, Chinese Academy of Science, Hefei 230031, China; b Institute of Electronic Engineering, Hefei 230037, China
  • Received:2005-07-01 Revised:2005-08-26 Online:2006-03-20 Published:2006-03-20
  • Supported by:
    Project Supported by the National Natural Science Foundation of China (Grant Nos 10375070 and 10305012).

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摘要： Multi-channel soft x-ray (SX) detectors are applied to generate images of magnetohydrodynamic (MHD) oscillation on the HT-7 tokamak, and the data from SX cameras are analysed by using the Fourier--Bessel harmonic reconstruction method and the singular value decomposition. The image reconstruction of SX emissivity is obtained on the assumption of plasma rigid rotation. One of the important phenomena in the HT-7 discharge is the transition from the sawtooth oscillations to the MHD oscillations when the plasma density grows higher. The MHD structure observed in the SX tomography is featured as follows: the magnetic surface of MHD structure is made up of the crescent-shaped ``hot core'' and the circular ``cold bubble''. The structure of the magnetic surface is relatively stable. It rotates in the direction of the electron diamagnetic drift at a frequency being the oscillation frequency of the MHD oscillations.

关键词: soft x-ray tomography, magnetohydrodynamic oscillation, singular value decomposition

Abstract: Multi-channel soft x-ray (SX) detectors are applied to generate images of magnetohydrodynamic (MHD) oscillation on the HT-7 tokamak, and the data from SX cameras are analysed by using the Fourier--Bessel harmonic reconstruction method and the singular value decomposition. The image reconstruction of SX emissivity is obtained on the assumption of plasma rigid rotation. One of the important phenomena in the HT-7 discharge is the transition from the sawtooth oscillations to the MHD oscillations when the plasma density grows higher. The MHD structure observed in the SX tomography is featured as follows: the magnetic surface of MHD structure is made up of the crescent-shaped ``hot core'' and the circular ``cold bubble''. The structure of the magnetic surface is relatively stable. It rotates in the direction of the electron diamagnetic drift at a frequency being the oscillation frequency of the MHD oscillations.

Key words: soft x-ray tomography, magnetohydrodynamic oscillation, singular value decomposition

中图分类号:  (Tokamaks, spherical tokamaks)

  • 52.55.Fa
52.35.Fp (Electrostatic waves and oscillations (e.g., ion-acoustic waves)) 52.30.Cv (Magnetohydrodynamics (including electron magnetohydrodynamics)) 52.35.Py (Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.))