58 / 2023-10-07 14:00:21

Relative calibration and experimental results of ECEI near q=1 surface on J-TEXT

Electron cyclotron emission imaging (ECEI);,Sawtooth;,Relative calibration.

1.Renewable energy system > (4)、Other topics in renewable energy

Electron cyclotron emission imaging (ECEI) is widely utilized for measuring temperature perturbations in tokamaks. ECEI measurements are typically processed by normalizing fluctuations relative to the mean time-period signal. However, measuring phenomena with low temperature disturbance proves challenging and requires calibration to obtain static or low-disturbance magnetohydrodynamic (MHD) phenomena. This paper employs the hypothesis of temperature flattening during sawtooth collapse, along with two-dimensional rotation matching with GS displacement and a linear extrapolation method, to perform relative calibration of the ECEI channel. This paper reconstructed a two-dimensional image of the relative calibrated electron temperature and subsequently analyze the experimental phenomenon.