Número especial que recoge: Papers from the 21st International Toki Conference on Integration of Fusion Science and Technology for Steady State Operation. [Resumen]. Microwave reflectometry technique has experienced significant advances in the last two decades becoming a very attractive diagnostic presently used in almost all fusion devices. This technique allows measuring electron density profiles, plasma instabilities, turbulence and radial electric fields with excellent spatial and temporal resolution. Although it is not straightforward, the extension of reflectometry to future devices is possible partially due to the limited access needed to accommodate the antennas inside the vacuum vessel keeping the sensitive elements as microwave sources and detectors outside the radiation area. However, in order to achieve a good diagnostic performance, limitations related to relativistic effects, intense neutron- and ?-radiation and long pulse operation have to be considered in the reflectometer design phase.
radio-frequency and microwave measuremen ts; tokamak; stellarator; steady-state operation