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The JT-60SA project is now in progressing to explore new domain in the high beta plasmas complementing ITER toward DEMO by using various heating systems. The JT-60SA is going to be equipped with neutral beam injection (NBI) system consisting of eight perpendicular NBIs(P-NBI), two tangential NBIs (T-NBI) and one negative ion based NBI(N-NBI); each injector for P-NBI and T-NBI has ~20 MW injection power with ~85 keV beam energy and N-NBI has 10MW with 500 keV. Such a high injection power could damage the wall of the NBI duct and bellows along beam line when a portion of the neutral beam is re-ionized due to collision with a neutral gas and bended to the wall by the magnetic field. This heat load is estimated to be 0.1-3 MW/m2. It is necessary to install the protection plates for the NBI duct and bellows. In this article, the design of the NBI protection plates of the JT-60SA and results of thermal mechanical analyses are presented.
The NBI protection plates(NPP) which has a water-cooling system for long pulse discharges up to 100s are installed in the NBI ducts to protect from heat load. The NPP are designed in three types for P-NBI, T-NBI and N-NBI duct walls. Each of the NPP is separated into three parts along the beam line, which are the port area, the bellows area and the port extension area. The protection plates in the port area are composed of 12-18 plates. The shape of this plate is long in the beam line direction and narrow in the width direction (~2000mm x ~150mm) to reduce the EM force due to the plasma disruption. In the bellows area, the protection plates are conical or columnar plates bonded to the cooling pipes, which are divided into four parts for the installation. The components of the NPP are made from CuCr because the thermal conductivity and proof strength of CuCr are relatively high.
Thermal mechanical analyses using finite element method were carried out to design the NPP and to confirm its soundness against the expected heat load. It is found that the evaluated temperature and thermal stress of the NPP were reasonably low.
会議概要（会議名, 開催地, 会期, 主催者等）
18th International Conference on Plasma-Facing Materials and Components for Fusion Applications
Thermal Mechanical Analysis of NBI Protection Plates for JT-60SA
