My research activity started with the development of coherent sources of electromagnetic radiation at micrometer wavelength (lasers for biomedical applications) and in the millimeter wave range (gyrotron systems for tokamaks). I’ve contributed to the design, installation and application in plasma experiments of the Electron Cyclotron Waves Heating system for FTU tokamak (ENEA, Frascati) and to the design of Electron Cyclotron Heating and Current Drive system of ITER. The application of Electron Cyclotron Waves for the active suppression of the magnetohydrodynamic instabilities has then focused my work with the design and analysis of closed loop control experiments in various tokamaks devices such Asdex Upgrade at the Max Planck Institute in Garching Munich, the Tokamak à Configuration Variable of the Ecole Federale Politechnique in Lausanne, and in preparation of Japanese-European tokamak JT-60SA in Naka, Japan. In order to develop such active control schemes, I’ve carried out studies to derive in real time the necessary information from the magnetic and electron temperature diagnostics. In the area of diagnostics, I’ve led the design of the Oblique EC Emission diagnostics for the tokamak JET (the Joint European Torus developed by the European Community in Oxford, UK)), meant to study the energy distribution of the electrons in high temperature plasmas. My work in JET also concerns the wide field of plasma operations and the studies aiming to prevent magnetohydrodynamics instabilities and plasma disruptions.