Identification of m=2 competent mode of complex magneto-hydro-dynamics activities during internal soft disruption based on singular value decomposition and tomography of soft-X-ray emission on the HT-7 tokamak

doi:10.1088/1674-1056/21/5/055208

中国物理B ›› 2012, Vol. 21 ›› Issue (5): 55208-055208.doi: 10.1088/1674-1056/21/5/055208

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇下一篇

Identification of m=2 competent mode of complex magneto-hydro-dynamics activities during internal soft disruption based on singular value decomposition and tomography of soft-X-ray emission on the HT-7 tokamak

徐立清,胡立群,李二众,陈开云,刘志远,陈晔斌,张继宗,周瑞杰,杨茂,毛松涛,段艳敏

Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

收稿日期:2011-08-27 修回日期:2012-04-27 出版日期:2012-04-01 发布日期:2012-04-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10935004).

Identification of m=2 competent mode of complex magneto-hydro-dynamics activities during internal soft disruption based on singular value decomposition and tomography of soft-X-ray emission on the HT-7 tokamak

Xu Li-Qing(徐立清), Hu Li-Qun(胡立群)^†, Li Er-Zhong(李二众), Chen Kai-Yun(陈开云), Liu Zhi-Yuan(刘志远), Chen Ye-Bin(陈晔斌), Zhang Ji-Zong (张继宗), Zhou Rui-Jie(周瑞杰), Yang Mao(杨茂), Mao Song-Tao(毛松涛), and Duan Yan-Min(段艳敏)

Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

Received:2011-08-27 Revised:2012-04-27 Online:2012-04-01 Published:2012-04-01
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10935004).

摘要/Abstract

摘要： In this paper, the singular value decomposition (SVD) method as a filter is applied before the tomographic inversion of soft-X-ray emission. Series of 'filtered' signals including specific chronos and topos are obtained. (Here, chronos and topos are the decomposed spatial vectors and the decomposed temporal vectors, respectively). Given specific magnetic flux function with coupling m=1 and m=2 modes, the line-integrated soft-X-ray signals at all chords have been obtained. Then m=1 and m=2 modes have been identified by tomography of simulated 'filtered' signals extracted by the SVD method. Finaly, using the experimental line-integrated soft-X-ray signals,m=2 competent mode of complex magnetohydrodynamics(MHD) activities during internal soft disruption is observed. This result demonstrates that m=2 mode plays an important role in internal disruption (Here, m is the poloidal mode number).

关键词: singular value decomposition, disruption, soft-X-ray tomography, tokamak

Abstract: In this paper, the singular value decomposition (SVD) method as a filter is applied before the tomographic inversion of soft-X-ray emission. Series of 'filtered' signals including specific chronos and topos are obtained. (Here, chronos and topos are the decomposed spatial vectors and the decomposed temporal vectors, respectively). Given specific magnetic flux function with coupling m=1 and m=2 modes, the line-integrated soft-X-ray signals at all chords have been obtained. Then m=1 and m=2 modes have been identified by tomography of simulated 'filtered' signals extracted by the SVD method. Finaly, using the experimental line-integrated soft-X-ray signals,m=2 competent mode of complex magnetohydrodynamics(MHD) activities during internal soft disruption is observed. This result demonstrates that m=2 mode plays an important role in internal disruption (Here, m is the poloidal mode number).

Key words: singular value decomposition, disruption, soft-X-ray tomography, tokamak

中图分类号: (X-ray and γ-ray measurements)

52.70.La

52.55.Fa (Tokamaks, spherical tokamaks) 52.65.Kj (Magnetohydrodynamic and fluid equation)

徐立清,胡立群,李二众,陈开云,刘志远,陈晔斌,张继宗,周瑞杰,杨茂,毛松涛,段艳敏. Identification of m=2 competent mode of complex magneto-hydro-dynamics activities during internal soft disruption based on singular value decomposition and tomography of soft-X-ray emission on the HT-7 tokamak[J]. 中国物理B, 2012, 21(5): 55208-055208.

Xu Li-Qing(徐立清), Hu Li-Qun(胡立群), Li Er-Zhong(李二众), Chen Kai-Yun(陈开云), Liu Zhi-Yuan(刘志远), Chen Ye-Bin(陈晔斌), Zhang Ji-Zong (张继宗), Zhou Rui-Jie(周瑞杰), Yang Mao(杨茂), Mao Song-Tao(毛松涛), and Duan Yan-Min(段艳敏) . Identification of m=2 competent mode of complex magneto-hydro-dynamics activities during internal soft disruption based on singular value decomposition and tomography of soft-X-ray emission on the HT-7 tokamak[J]. Chin. Phys. B, 2012, 21(5): 55208-055208.

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Identification of m=2 competent mode of complex magneto-hydro-dynamics activities during internal soft disruption based on singular value decomposition and tomography of soft-X-ray emission on the HT-7 tokamak

Identification of m=2 competent mode of complex magneto-hydro-dynamics activities during internal soft disruption based on singular value decomposition and tomography of soft-X-ray emission on the HT-7 tokamak

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