Numerical analysis of a cooling system for high heat flux components in the neutral beam injection system

Temperature control of the high heat flux (HHF) components in the neutral beam injection (NBI) system in the Experimental Advanced Superconducting Tokamak (EAST) is a very important issue for realizing a high-parameter steady state condition in the tokamak. This paper presents a 3-D computational fluid dynamics analysis of a cooling system of a residual ion dump (RID) composed of hypervapotron structures, which has been previously used in the Mega-Amp Spherical Tokamak (MAST). The results obtained by the proposed method coincide well with experimental values, which validate this method. This study provides a powerful tool for protecting the HHF components in the NBI system from overheating and sustaining irreparable damage. Moreover, this study provides a potentially useful method for optimizing the structural design of HHF components in the NBI system.