ECE Imaging Upgrade and Sawtooth Reconnection on EAST

摘要

A new optical imaging system designed for two dimension (2D) ECEI diagnostics which contains hyperboloid lens are now working well on EAST tokamak. The 16 mixers array elements measure the plasma electron cyclotron emission at 8 frequencies simultaneously, the electron temperature profiles and its fluctuation over an area of 20cm (vertical) by 6cm (horizontal) could then been analyzed. We have been taking results of the sawtooth oscillation in the core plasma of the EAST device. The evolutions of the sawtooth precursor activities on EAST will be given in detail.