Pei, S. Guan, L.L. Jia, Y. Jin, Z.J. Li, B. Li, M. Liu, J.Y. Pan, G.F. Wang, F. Wang, L. Wang, Y. Xia, S.B. Xing, Y. Yang, G. Yin, Z.G. Zhang, S.P. Zhang, T.J. Zhu, X.F. JACoW Publishing Geneva, Switzerland 2673-5482 978-3-95450-212-7 10.18429/JACoW-CYCLOTRONS2022-THPO015 English 338-341 cavity proton simulation cyclotron GUI Contribution to a conference proceedings 2023 2023-10 https://doi.org/10.18429/JACoW-CYCLOTRONS2022-THPO015 https://jacow.org/cyclotrons2022/papers/thpo015.pdf A proton circular accelerator complex composed of a 100 MeV separated radial sector cyclotron, an 800 MeV separated spiral sector cyclotron and a 2 GeV FFA was proposed and is being studied at CIAE. To satisfy the beam dynamics requirements of the FFA, NC RF cavity with high Q and R will be adopted. It is found that the boat shape cavity is the most promising candidate. Therefore, R&D on a 177.6 MHz 1:4 scale boat shape prototype cavity is being carried out to study all aspects of developing such a high-power cavity. In this scenario, self-consistent multi-physics coupled simulation study with ANSYS HFSS and Workbench was carried out. This paper describes the method to deal with a mechanical model including hundreds of bodies in the FEM analysis and shows the simulation results. In addition, the manufacturing technology and some testing results are also presented.