Analysis of diffusive coefficient of electron heat pulse based on singular value decomposition in HT-7 tokamak

doi:10.1088/1674-1056/19/3/035203

Abstract In this paper, singular value decomposition (SVD) as a filter-noise method is applied to electron cyclotron emission (ECE) diagnostic signals. The decomposed vectors contain the information about sawtooth such as the temporal vectors that show the sawtooth period and the spatial vectors that indicate the inverse radius. The propagation of electron heat pulse is investigated from electron cyclotron emission signals by using the perturbation method in HT-7 tokamak. The heat diffusivities are obtained at different densities in ohmic plasmas. The special result is that the heat diffusivity becomes larger as the heat pulse propagates outwards from the outside of the inverse radius.

Keywords: electron cyclotron emission ohmic plasma heat diffusivity tokamak

Received: 25 February 2009
Revised: 01 September 2009
Accepted manuscript online:

PACS:	52.55.Fa	(Tokamaks, spherical tokamaks)
	52.25.Os	(Emission, absorption, and scattering of electromagnetic radiation ?)
	52.70.Gw	(Radio-frequency and microwave measurements)
	52.65.Vv	(Perturbative methods)
	52.25.Fi	(Transport properties)

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Li Er-Zhong(李二众), Ling Bi-Li(凌必利), Liu Yong(刘永), Ti Ang(提昂), Hu Li-Qun(胡立群), and Gao Xiang(高翔) Analysis of diffusive coefficient of electron heat pulse based on singular value decomposition in HT-7 tokamak 2010 Chin. Phys. B 19 035203

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Analysis of diffusive coefficient of electron heat pulse based on singular value decomposition in HT-7 tokamak

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