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A synchrotron injection scheme for the SuperKEKB high-energy ring (HER) was implemented and experimentally evaluated. The lattice at the HER injection point was configured to provide a large horizontal dispersion of –1.6 m, and the sextupoles were optimized accordingly. Because an abort system is located near the injection point, the optics design was constrained to ensure compatibility with the abort-system requirements. Optics solutions were developed to enlarge the dynamic aperture for interaction-point β_y* values of 81 mm, 8 mm, 3 mm, and 1 mm. A systematic procedure of the injection parameters has been established using a turn-by-turn BPM in the ring. The betatron components of the injected beam was successfully removed.
Using the optimized optics, synchrotron injection into the HER was successfully demonstrated, followed by the establishment of stable beam–beam collisions and the production of luminosity. As the injection repetition rate was increased, however, an unexpected degradation in injection efficiency was observed, leading to the suspension of the study. These experimental results and possible mechanisms that contributed to the observed injection degradation will be reported.
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