HL-2M上偏滤器结构初步设计 及关键制造工艺预研

在充分考虑HL-2M装置的物理目标后，将位于真空室内顶部的上偏滤器设计成“W”形的模块化结构。单个模块由SS-316L背板、石墨块、石墨箔及各类紧固件等组成，模块两端仅通过纬环和焊接螺柱与真空室壳体固定。这种结构为诊断部件提供了尽可能多的空间。利用有限元分析方法，对上偏滤器模块进行了电磁力、结构和热应力等分析。通过优化支撑结构、螺柱数量等，使得偏滤器结构能够满足各类工况条件。最后完成了关键制造工艺的预研，包括焊接工艺、深孔钻工艺、装配、非标紧固件研制等。检测数据表明，预制件最终安装面(石墨块轮廓)与标准模板之间的间隙＜1mm，各相邻石墨之间的间隙≤0.5mm，错边≤0.5±0.2mm，且整个模块的漏率<2.5×10-10 Pa·m3·s-1。这些结果为HL-2M上偏滤器的正式加工提供了支撑。

Preliminary structural design and key manufacturing technology pre-research of HL-2M upper divertor

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.