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Description
The vertical beam scraper for the Siam Photon Source II (SPS-II) storage ring is designed for beam halo cleaning and protection of narrow-gap insertion devices. Compared with the horizontal scraper, the vertical configuration requires a wider blade for effec-tive halo interception, resulting in a more pronounced geometric discontinuity and a potentially larger con-tribution to the beam coupling impedance. This work presents the electromagnetic optimization of the verti-cal scraper using the CST Studio Suite Wakefield Solver. The blade dimensions, chamber aperture, and transition geometry were systematically modified within practical mechanical constraints. The resulting designs were evaluated in terms of longitudinal im-pedance, loss factor, beam-induced power, and trans-verse wakefield effects to identify a configuration that minimizes the scraper impedance while preserving the required mechanical functionality.
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