Analysis of the electron temperature measurement in TCABR tokamak by electron cyclotron emission and infrared Thomson scattering diagnostics

This work presents the experimental analysis of the central electron temperature measured by the electron cyclotron emission (ECE) radiometer and the infrared Thomson Scattering (ITS) diagnostic. The detection of the ECE radiation is done by a heterodyne scanning radiometer that works at the second harmonic extraordinary mode, in frequency range from 50 to 85GHz, which allows measurement of the radial profile of electron temperature with good spatial and temporal resolutions. The ITS diagnostic uses a Neodymium Glass laser (wavelength 1.054 μm). This ITS diagnostic measures the electron temperature in the center of plasma column one time during plasma shot. Results also show a discrepancy between the two diagnostics in the electron temperature measurement in the presence of Magnetohydrodynamics activity that gives an explanation for this apparent inconsistency.