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Description
In SuperKEKB, the emittance of the injected beam is an essential parameter that significantly affects the injection rate. In the linac, the beam tail can be kicked depending on the orbit through the accelerating structures, which leads to a degradation of the emittance. Fortunately, these effects can be minimized by appropriately optimizing the beam trajectory. On the other hand, the KEKB Linac uses pulse steering to supply beams to four different rings. However, the number of pulse steering is limited in the upstream part of the Linac, and orbit drift in the upstream part often leads to emittance drift, deteriorating injection rate. To address this issue, we have developed a non-destructive emittance tuning system utilizing Synchrotron Radiation Monitors.
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