Thermo mechanical design of Collective Thomson Scattering components for ITER
France
Collective Thomson Scattering (CTS) is a diagnostic system whose main function is to measure a number of important plasma parameters, such as alpha particles resulting from Deuterium-Tritium fusion reactions.
In the CTS diagnostic system, a high-power microwave beam (1 MW at 60 GHz) is injected and the particles in the plasma scatter this incident radiation. The spectrum of the scattered radiation (in the order of mW) provides information about these particles.
Fusion for Energy (F4E) coordinated the design work of several suppliers, where IDOM had to perform the thermal and mechanical design of the launcher waveguide, reflector mirrors, cassette (component housing all the outlet beam mirrors) and the 8 receiver waveguides.
All components were designed with a cooling system due to the high thermal load of the waveguide beam and the thermal deposition of the neutron loads of the reactor. The material commonly used for all components was stainless steel, although a specific alloy with a high thermal conductivity was used for the mirrors in order to adequately dissipate the thermal load concentration of the microwave beam.
Thermal and mechanical analyses of all components were performed with finite element analysis (FEA) using ANSYS APDL. The Collective Thomson Scattering design was evaluated according to the criteria of the ITER SDC-IC and RCC-MRx code with all the required loads of ITER.
