Effect of the plasma density and heating power on the intensity of electron cyclotron radiation from the plasma of the L-2M stellarator

The results of the experimental studies on the plasma behavior in the modes with the high power contribution to the electrons by the electron-cyclotron heating on the electron gyrofrequency second harmonics and by the heating rate of 120-400 kW are presented. It is shown that by decrease in the plasma density and increase in the heating rate there takes place the electron-cyclotron radiation spectrum deformation. By the low plasma density the radiation intensity on the second harmonic of the electron-cyclotron frequency increases, whereas the plasma energy does not grow. This raises the question on the correctness of the plasma Te determination by means of the electron-cyclotron radiation diagnostics under such conditions