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Description
The main linac section of the STCF (Super Tau Charm Facility) injector is designed to simultaneously accelerate positron and electron beams from an initial energy of 1 GeV to a maximum of 3.5 GeV. Its configuration mainly consists of SLAC-like Linacs, with a Triplet installed between every two Linacs. To mitigate the impact of installation and alignment errors, orbit correctors and beam position monitors (BPMs) are also arranged along the beamline. In this study, the physical design of the main linac section was first carried out via beam dynamics simulations, and the beamline layout was completed. Subsequently, an in-depth analysis was conducted on the beam orbit distortion caused by alignment errors of beamline components, as well as the degradation of beam quality parameters induced by wakefields arising from such orbit distortions. To address these issues, beam alignment algorithms were employed for online alignment and optimization. Beam dynamics calculations demonstrate that both the beam orbit and quality parameters after optimization meet the designed specifications. This research provides theoretical basis and technical support for the engineering implementation of the main linac section in the STCF injector.
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