Lattice design of the transport system for the bypass line in the storage ring based fully coherent light source

[Methods]: In this paper, the lattice of the beam transport line was designed, and the calculated beam optics satisfying the design requirements were described. Firstly, the geometric layout requirements were satisfied between the storage ring and the energy modulation section & energy demodulation section. Secondly, the beam optics functions were matched to ensure the high transport efficiency.

Finally, the effect caused by the misalignment errors and magnet field errors were discussed. [Results]: Taking the dispersion introduced by the kicker and septum into account, the beam optics of the transport line is satisfied to the design requirements. Meanwhile, the orbit distortion caused by the misalignment errors and magnet field errors is reduced to approximately 4%~5% of that before correction within errors. [Conclusions]: Under the geometric layout condition, the beam optics of the transport system for the bypass line meet the specified design requirements.

With considering of installation errors and magnet field errors, the orbit distortion after orbit correction can be limited in a small range, and the theoretical transport efficiency can reach 100%.