In this study, we analyzed the design of a source lens for a free-electron laser (FEL) module and proposed an optimized module equipped with multiple tips using carbon nano-tube (CNT) paste. We proposed the combination of a wiggler structure and source lens structure optimized for the electron beam trajectory, using an electrostatic wiggler. The optimal configuration consisted of a circular extractor and accelerator electrodes (to reflect the tip structure) and a rectangular limiting aperture (to reflect the wiggler structure). We also investigated the use of multiple electron tips and demonstrated that the optimal configuration obtained using the CNT paste was the most efficient configuration for a FEL module. These findings provide valuable insights into the design of high-performance FEL modules.
An alternative in-line X-ray imaging method was investigated in order to visualize the internal object structure with high inspection throughput. A novel in-line tomosynthesis imaging geometry was proposed using the self-manufactured stationary multi-source-based conveyor system. The system consists of five stationary X-ray sources in a tube housing module and a stationary detector while a battery object was moving on a conveyor belt. We studied the effect of X-ray beam tilting and rotation angles with different conveyor speeds and magnification factors to explore the optimized multi-source in-line tomosynthesis imaging condition. The results indicated that the in-line tomosynthesis imaging would give higher imaging speed than the referenced CT imaging by showing a 2.5 times faster image acquisition time. Tomosynthesis with arc-and-tilted multi-source tomosynthesis geometry gave 19% lowered errors (root-mean-square-error) than the straight-beam multi-source tomosynthesis geometry when compared to the ground-truth digital battery phantom. In conclusion, the proposed novel multi-source tomosynthesis geometry would provide higher throughput while maintaining the image quality compared to CT.
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