Optical thickness corrections to ECE measurement of electron temperature in IR-T1 tokamak

摘要

The Electron Cyclotron Emission (ECE) radiation has been investigated, passing through plasma column with concerning absorption effect on the IR-T1 tokamak. The intensity of second harmonic X-mode is used to investigate changes in electron temperature profile. The results show that radiation temperature (T rad) detected outside the plasma column is less than the electron temperature (T e) in the core. The radiation temperature can be directly interpreted as T e to about 3-10% reduction. This implies that optical thickness and electron density effects are more considerable at lower temperatures.