Diagnóstico de temperatura em tokamaks através do uso de bobinas Rogowski

Abstract

In the present work we calculated the electronic mean temperature of the TCABR plasma through its resistivity. The first step in obtaining the temperature consists in analyzing the momentum equation of electrons and ions in relation to the collisional term. We use the theory of small angle Coulomb collisions that obey the Fokker-Planck equation for analysis of the kinetic model, where we present a more rigorous determination of the value of the resistivity η in the Lorentz gas approximation. Since we have the numerical value of η, we can then get the average plasma temperature as a function of tokamak parameters such as the I p plasma current, the V l loop voltage, and the respective radii R . To obtain the plasma current and the loop voltage, some of the shots found in a TCABR database were analyzed. In our analyzis, we obtain the temporal evolution of the temperature in the whole interval of the shot, and then we compare our results to experimental works, whose temperature measurements were obtained by Thomson scattering and cyclotron electron emission methods. The results obtained through the use of Rogowski coil are consistent, both qualitatively and quantitatively, to the reported behavior obtained with the Thomson and ECE methods. Thus, the use of Rogowski coils is a viable alternative for temperature diagnosis in tokamaks.