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Spatio-temporal evolutions of the sawteeth activities are measured simultaneously with a 16 channel high spatio-temporal resolution electron cyclotron emission(ECE)heterodyne radiometer on HT-7 and the evolutions of the sawteeth are found to be diffusive in character. By a perturbative analysis,the electron heat diffusivity χ_e inferred by time-to-peak method and Fourier transform shows a good agreement.The value of electron heat diffusivity shows radial asymmetry between the low magnetic field side(LFS)and the high magnetic field side(HFS).It is observed that with the increase in plasma density,the electron heat diffusivity decreases and the confinement of energy is improved.By comparing with χ_e~(pb)inferred by static power balance analysis,the result indicate that χ_e~(hp)is larger than XpD by a factor ranging from 2 to 10.
Spatio-temporal evolutions of the sawteeth activities are measured simultaneously with a 16 channel high spatio-temporal resolution electron cyclotron emission (ECE) heterodyne radiometer on HT-7 and the evolutions of the sawteeth are found to be diffusive in character. By a perturbative analysis , the electron heat diffusivity χ_e inferred by time-to-peak method and Fourier transform shows a good agreement. The value of electron heat diffusivity shows radial asymmetry between the low magnetic field side (LFS) and the high magnetic field side (HFS). It is observed that with the increase of plasma density, the electron heat diffusivity decreases and the confinement of energy is improved.By comparing with χ_e ~ (pb) inferred by static power balance analysis, the result indicates that χ_e ~ (hp) is larger than XpD by a factor ranging from 2 to 10.