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@inproceedings{wan:sap2023-tupb019, % --- JACoW template Dec 2024 --- author = {X.M. Wan and Z. Li and W.L. Liao and P.T. Lin and X.B. Luo and X.J. Pu and Z.Q. Ren and Y.F. Yang}, % author = {X.M. Wan and Z. Li and W.L. Liao and P.T. Lin and X.B. Luo and X.J. Pu and others}, % author = {X.M. Wan and others}, title = {{Beam Dynamics in Superconducting Proton Linac}}, booktitle = {Proc. 14th Symp. Accel. Phys. (SAP'23)}, eventdate = {2023-07-10/2023-07-12}, pages = {126--128}, eid = {TUPB019}, language = {english}, keywords = {focusing, quadrupole, simulation, acceleration, resonance}, venue = {Xichang, China}, series = {Symposium on Accelerator Physics}, number = {14}, publisher = {JACoW Publishing}, location = {Geneva, Switzerland}, date = {2024-11}, month = {11}, year = {2024}, isbn = {978-3-95450-265-3}, doi = {10.18429/JACoW-SAP2023-TUPB019}, url = {https://jacow.org/sap2023/papers/tupb019.pdf}, abstract = {{Beam loss control is a crucial research direction in high-current superconducting linear accelerators (SCL). The research findings include firstly, for continuous beams, when tune depression eta > 0.7, zero current periodic phase advance (σ0t) can partially exceed 90° during transport in solenoid and quadrupole doublet periodic focusing channels. Different results occur when eta < 0.7. Secondly, in the solenoid system, σ0t can partially exceed 90° without significant impact on beam quality. In the quadrupole doublet focusing system, the partial breakdown of 90° affects beam quality. Thirdly, Similar conclusions hold for acceleration effects. Fourthly, numerical analysis shows that double-period structures have more stringent design criteria than fully period structures. The double-period structure can cause envelope instability even if σ0t < 90°. Fifthly, the primary factor causing halo is the 2:1 resonance. Additionally, when eta is small, higher-order resonances can also cause halo.}}, }