Impurity behaviour during ecr heating in the T-10 tokamak

The results of experimental study on behaviour of light and medium impurities in the Tokamak-10 device when heating a plasma at the first harmonics of the electron-cyclotron resonator (ECR) are presented. It is shown that ECR-heating may. be followed by an essential increase in impurity flows and radiation losses. It is concluded that the emission of impurities is negligible in the energy balance of electrons. There exists a range of optimum plasma parameters where impurity effects are minimum. Peripheral absorption of an extraordinary wave in the region of ECR or upper-hybride resonance may be responsible for impurity occurrence in the given experiments