Abstract
Using various neutron focusing techniques to obtain the focal spot with small size and high gain at the sample location is highly desired in micro-area analysis. Our previous work fully demonstrated the feasibility of polycapillary lenses in the field of neutron focusing; however, the focusing performance of the lens fell short of expectations. This study attempts to optimize the lens by adjusting the design parameters of the lens in order to achieve better focusing performance and higher gain. In addition, microscopic observations revealed that the previously developed lens has some defects in its microstructure, which are not conducive to neutron transmission. In this paper, a manual sorting process was added to the lens manufacturing process to obtain a lens with improved microstructure. The focusing performance of the optimized lens was tested using quasi-parallel neutron beams from China Spallation Neutron Source (CSNS). The experimental results confirm the effectiveness of the optimization strategies, which has a significant guiding property on the development of lenses.
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