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.
We studied the stage transfer synchronization method to improve the low throughput which is the biggest drawback of the raster scan method when applied to image acquisition in a low energy microcolumn system. Through preliminary experiments, we were able to acquire some sample images
and some images of the measured samples by applying the synchronization method to a conventional single-microcolumn system. The image acquired in this preliminary experiment was three times larger than that acquired by the raster scan method in the vertical direction. In this study, we tested
two types of the synchronization method: the first method acquires an image by horizontal electron beam scanning followed by a vertical stage transfer, and the second one acquires an image by vertical electron beam scanning followed by a horizontal stage transfer. By applying the vertical
stage transfer synchronization method, we could acquire a larger image than that acquired by the conventional raster scan method. The vertical stage transfer synchronization method image was 1.8 times larger in the horizontal direction and 6 times larger in the vertical direction. In addition,
a larger image approximately nine times in the horizontal direction and five times in the vertical direction was acquired by applying the horizontal stage transfer synchronization method.
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