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

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).

Keywords: singular value decomposition disruption soft-X-ray tomography tokamak

Received: 27 August 2011
Revised: 27 April 2012
Accepted manuscript online:

PACS:	52.70.La	(X-ray and γ-ray measurements)
	52.55.Fa	(Tokamaks, spherical tokamaks)
	52.65.Kj	(Magnetohydrodynamic and fluid equation)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10935004).

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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 2012 Chin. Phys. B 21 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

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