基于椭球面光栅理论,提出柱面光栅概念,并对其衍射特性和集光本领进行研究。结果表明;在掠入射条件下凹柱面光栅具有与四球面光栅相似的衍射特性,但四柱面光栅可以方便地沿光栅母线方向划分成若干相同部分独立工作,因此,安装水平隔板的掠入射凹柱面光栅单色仪可以用于托卡马克等离子体的真空紫外(VUV)光谱时空分辨测量。 Based on the ellipsoid grating theory, the concept of cylindrical grating is proposed, and its diffraction characteristics and light collecting ability are studied. The results show that concave gratings have the same diffraction characteristics as the four-spherical gratings under grazing incidence. However, the four-grated gratings can be easily divided into several identical sections along the grating bus bar to work independently. Therefore, Concave cylindrical grating monochromators can be used for spatio-temporal resolution measurements of vacuum ultraviolet (VUV) spectroscopy of tokamak plasmas.