关键词: HL-2M装置, 偏滤器, 结构设计, 焊接

Abstract: In consideration of the physical target of the HL-2M tokamak, the upper divertor located at the top of the vacuum vessel is designed as a "W" shape modular structure. The single module consists of SS-316L back plate, graphite block, graphite foil and various fasteners, and two ends of the module are only fixed by weft rings and welded studs, which provide more space for the diagnostic components. The finite element method is used to analyze the electromagnetic force, structure and thermal stress of the upper divertor module. By optimizing the support structure and the number of studs, the divertor structure can meet various working conditions. Finally, the pre-research of key manufacturing technologies processes, including welding process, deep hole drilling process, assembly, non-standard fastener development, etc. Those test data indicate that the gap between the final mounting surface of the preform (graphite block profile) and the standard template is less than 1mm, and the gap between adjacent graphites is not more than 0.5mm, the misalignment is between 0.5±0.2mm, and the leak rate of this module is below 2.5′10?10Pa·m3·s?1. These results provide technique support for the formal manufacturing of HL-2M upper divertor.

Key words: HL-2M tokamak, Divertor, Structural design, Welding