Optimum design of the ITER in-vessel plasma-position reflectometry antenna coverage

The ITER plasma position reflectometry (PPR) system measures the edge electron density profile of the plasma, providing real-time supplementary contribution to the magnetic measurements of the plasma wall distance. The reflectometry antenna is one of the most critical components as it is the first in direct sight of the plasma. Its optimization is important to improve the structural performance of the antenna, here focused in the temperature and deformation. In this work, adaptive single-objective optimization (ASO) and adaptive multiple-objective optimization (AMO) are used to find optimized coverage distributions in the antenna, while maintaining its internal geometry that is relevant for microwave diagnostics. The optimized design obtained presents lower maximums and average temperatures and deformation. Hence, this design is a suitable alternative to be further considered for the ITER PPR system. (C) 2017 Elsevier B.V. All rights reserved.