Progress of the ECRH Upper Launcher design for ITER

tThe design of the ITER ECRH system provides 20 MW millimeter wave power for central plasma heatingand MHD stabilization. The system consists of an array of 24 gyrotrons with power supplies coupled toa set of transmission lines guiding the beams to the four upper and the equatorial launcher. The frontsteering upper launcher design described herein has passed successfully the preliminary design review,and it is presently in the final design stage. The launcher consists of a millimeter wave system and steeringmechanism with neutron shielding integrated into an upper port plug with the plasma facing blanketshield module (in-vessel) and a set of ex-vessel waveguides connecting the launcher to the transmissionlines.Part of the transmission lines are the ultra-low loss CVD torus diamond windows and a shutter valve,a miter bend section and the feedthroughs integrated in the plug closure plate. These components areconnected by corrugated waveguides and form together the first confinement system (FCS). In-vessel,the millimeter-wave system includes a quasi-optical beam propagation system including four mirrorsets and a front steering mirror. The millimeter wave system is integrated into a specifically optimizedupper port plug providing structural stability to withstand plasma disruption forces and the high heatload from the plasma side with a dedicated blanket shield module. A recent update in the ITER interfacedefinition has resulted in the recession of the upper port plug first wall panels, which is now integratedinto the design. Apart from the millimeter wave system the upper port plug houses also a set of shieldblocks which provide neutron shielding. An overview of the actual ITER ECRH Upper Launcher is giventogether with some highlights of the design.© 2014 Elsevier B.V. All rights reserved