JACoW is a publisher in Geneva, Switzerland that publishes the proceedings of accelerator conferences held around the world by an international collaboration of editors.
TY - CONF AU - Liao, Y.C. AU - Liu, X. AU - Luo, R.Y. AU - Qin, B. AU - Wang, W. ED - Schaa, Volker RW ED - Huang, Wenhui ED - Yan, Xueqing ED - Tang, Chuanxiang ED - Li, Lu TI - Design of a Large Momentum Acceptance Gantry Based on AG-CCT for Lightweight Proton Therapy Facility J2 - Proc. of SAP2023, Xichang, China, 10-12 July 2023 CY - Xichang, China T2 - Symposium on Accelerator Physics T3 - 14 LA - english AB - Superconducting (SC) gantry can be applied to proton therapy with significantly reduced footprint and weight. However, the relatively lower ramping limit of the SC magnetic field becomes a bottle-neck for fast energy change and beam delivery. The issue can be mitigated by designing a large momentum acceptance (LMA) beam optics. We present the design of an LMA gantry using AG-CCT SC magnets and symmetrical achromatic lattice. A fast degrader is combined in the design so that the gantry can rapidly switch energy during the treatment. The AG-CCT design process and beam transport simulation are all performed with our homemade integrated code CSPT, which has interfaces to Geant-4 and Opera, and can reach a maximum speed-up ratio of ~450 by applying parallel computation technique. The multi-particle simulation based on realistic field distribution proves that the gantry has a large momentum acceptance of ~20\%. Due to its large momentum acceptance, the dispersion effect caused by the scanning magnet is not neglectable. A dispersion compensation method, accompanied by a compact nozzle layout, is proposed to achieve a scanning field of 25×25 cm² with a maximum beam energy spread of 5.2\%. PB - JACoW Publishing CP - Geneva, Switzerland SP - 111 EP - 113 KW - toolkit KW - lattice KW - simulation KW - proton KW - optics DA - 2024/11 PY - 2024 SN - 978-3-95450-265-3 DO - doi:10.18429/JACoW-SAP2023-TUPB014 UR - https://jacow.org/sap2023/papers/tupb014.pdf ER -