3 the main facilities in our experiment are introduced . they consist of the hi - 13 model tandem accelerator , the 2 . 2 - meter grazing incidence vuv to soft x - ray monochromator and the data - processing system . the testing system is also described 3介绍了主要的实验设备,即hi - 13串列加速器和2 . 2米掠入射真空紫外到软x射线谱段光谱仪的结构和原理,介绍了实验数据获取系统和实验系统的调试。