Reaching thermonuclear temperatures in tokamaks requires additional heating of the plasma. Additional heating systems are based on injection of beams of neutral atoms or electromagnetic (e-m) waves. With the decision to use heavy metallic elements like tungsten for plasma-facing components in ITER, the in-depth understanding of the interaction between high-Z impurity ions e-m waves is of crucial importance. This key problem can be investigated extensively in the WEST tokamak at an ITER-relevant radio frequency power level. In this seminar, we would like to present the results of our research related to the heating of fusion plasmas containing high-Z impurities by an external e-m waves source.