The upgrade of the DIII–D EC system using 120 GHz ITER gyrotrons

The planned growth in the EC system on DIII–D over the next few years requires the installation of two depressed collector gyrotrons, a high voltage power supply, two low loss transmission lines, and the required support equipment. This new DIII–D EC equipment could be made identical to the ITER EC system requirements. By building the DIII–D hardware to the ITER specifications, it will allow ITER to gain beneficial prototyping experience on a working tokamak, prior to committing to building the hardware for delivery to ITER.