TRANSMISSION-LINE STUDIES FOR ITER COMPATIBLE REFLECTOMETERS

Corrugated circular transmission lines are considered as high performa nce, low loss, broadband lines for reflectometry on ITER. These lines are proposed as a possible solution for the equatorial low-field-side system and as a part (receiver-vacuum vessel) of the transmission line s for the high-field side and the out-of-midplane reflectometer system , because of their restricted access. Theoretical and experimental stu dies show the good properties of these lines: low losses, a smooth cha racteristic transmission, and a Very low level of parasitic reflection s. Quasioptical systems are also proposed as a solution for the coupli ng of several microwave emitter receivers, working in a fundamental wa veguide, into a single broadband corrugated line. (C) 1997 American In stitute of Physics.