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Description
The main linac of the Super Tau-Charm Facility (STCF) injector consists of 36 constant-gradient traveling-wave accelerating structures, each with a length of 3 m. Component misalignments can induce beam orbit distortions and emittance growth during long-distance transport. In this paper, an online beam alignment system for the STCF injector main linac is designed. A complete beam dynamics model is established to evaluate the effects of misalignments and determine the orbit correction requirements. A dual-direction corrector magnet is then designed through three-dimensional electromagnetic simulations to provide the required deflection capability. Finally, different BPM-corrector layouts are compared in terms of orbit correction performance and required deflection angles, and a suitable layout for high-performance beam operation is determined. The results provide a reference for the engineering design of the online beam alignment system for the STCF injector main linac.
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