在惯性约束聚变光谱诊断物理实验研究中，晶体衍射后X射线光谱信号较弱，需要高收光效率及宽频谱范围的光谱诊断仪器.在传统锥面弯曲晶体基础上提出变曲率弯晶多能点成像技术，该技术具有宽频谱范围、强聚焦能力、高光谱分辨的特点.在晶体衍射成像结构设计中，由于能够确保成像光线的旋转对称性，因此在原理上可消除传统弯晶X射线衍射成像像差.利用研制的变曲率面石英晶体对钛靶X射线源进行X射线聚焦检测，并与同种材料的平面晶体进行收光效率对比，实验结果表明该变曲率面石英晶体的收光效率可以达到平面石英晶体的100倍，检测X射线能量范围为4.51~5.14 keV.该晶体谱仪结合X射线条纹相机能够检测宽频谱范围的微弱X射线信号，条纹相机探测面可与晶体检测光路方向垂直布局.

In the spectrum diagnostic physics experiment of inertial confinement fusion, the spectral signal is weak due to the X-ray diffraction efficiency with crystal. So a spectral diagnostic instrument with high light collection efficiency and wide spectral range is urgently needed. A multi-curvature bent crystal multi-energy point imaging technique is proposed based on traditional conical crystal structure. It has the characteristics of wide spectral range, strong focusing ability and high spectral resolution. At the same time, it can eliminate imaging aberration in principle due to the rotational symmetry of imaging light. The measuring spectra experiment of multi-curvature bent α-quartz crystal is conducted at a Ti X-ray tube device and the same experiment with plane α-quartz crystal is done to demonstrate the strong focusing ability. The result shows that the intensity of multi-curvature bent α-quartz crystal is 100 times than that of plane crystal, and the energy range of detected X-ray is 4.51~5.14 keV. This device combined with a streak camera at a vertical direction could be used to collect weak X-ray with wide spectral range.