Emission and transmission measurements at the electron cyclotron frequency on TFR

Measurements of the electron cyclotron emission at the fundamental frequency and at second harmonic have been successfully used for measuring the time and space variations of the electron temperature. In this paper we report measurements of the emission and transmission at the electron cyclotron frequency carried out on the TFR 600 tokamak. The experimental arrangement consists of a set of two opposite circular horns positioned in the equatorial plane followed by oversize circular wave-guides ending in a microwave polarimeter which divides the wave polarization in two perpendicular direction. A microwave superheterodyne receiver with a single end broad band mixer has been used and the location of the emitting or absorbing region has been selected by setting the value of the local oscillator frequency in the interval 113-140 GHz