Shield components adopted to the ITER ECRH upper launcher

For control of plasma instabilities, especially neoclassical tearing modes, it is foreseen to inject a total of 20 MW mm-wave power at 170 GHz into the ITER plasma, using a front steering version of the upper launcher. The mm-wave components are integrated into the Upper Port Plug structure which accommodates individual shield components. They provide sufficient shielding and give way for the injected mm-wave power. The shield components presented in this paper are arranged by two major groups: The Front Shield, which is installed into the Blanket Shield Module (BSM) and consists of two discrete blocks. The shape of these components is adjusted to the requirements of the mm-wave system with the special goal to minimise arcing effects. The Port Plug main frame houses the Internal Shield, with two sections: A front section with sophisticated openings for the mm-waves and a rear section, which accommodates the mitre bends or mirrors of the mm-wave system.