Measurement of Carbon Ion Temperature in Tokamak IR-T1 Plasma Using Passive Spectroscopy

The study of ionic impurities present in tokamak plasma is an essential tool for studying plasma behavior and determining its various parameters such as temperature, electron density and plasma flow rate. For this purpose, high resolution optical spectroscopy system was installed on the Tokamak IR-T1 to measure the carbon-ion impurity temperature in the plasma. By processing the emission spectral lines recorded by the spectrometer, the location of the spectral line corresponding to the carbon impurity is estimated, and the effective width of the carbon spectral line is determined by matching a Gaussian function to the experimental data. Given the effective width of the carbon spectrum line, its doppler broadening and consequently the carbon ionic impurity temperature are calculated. Carbon CIII ion temperature is obtained about . The experimental impurity temperature is comparable to the results of ISTTOK and COMPASS tokamaks.