Zhang, S.P. Cai, H.R. Fu, W.F. Ji, B. Liu, J.Y. Pan, G.F. Wang, C. Yin, Z.G. Zhang, T.J. Zhou, H. Zhu, X.F. JACoW Publishing Geneva, Switzerland 2673-5482 978-3-95450-212-7 10.18429/JACoW-CYCLOTRONS2022-MOPO007 English 66-69 vacuum cyclotron MMI ion-source cavity Contribution to a conference proceedings 2023 2023-10 https://doi.org/10.18429/JACoW-CYCLOTRONS2022-MOPO007 https://jacow.org/cyclotrons2022/papers/mopo007.pdf In this paper, the design and installation CYCIAE-230 superconducting cyclotron main vacuum system’s equipment and the cryogenic systems based on the liquid helium zero-boiling-off technology for the CYCIAE-230 superconducting cyclotrons are described. The vacuum in the particle acceleration cavity is 2x10⁻⁴ Pa. The main technical features of the accelerator vacuum system are that the main magnet cover plate with diameter 3.12m are used as a part of the main vacuum chamber, 8 magnetic poles, 8 high frequency resonators, and 2 sets of striper targets and 2 sets of radial targets are installed in the main vacuum chamber, resulting in technical difficulties such as large surface gas discharge, virtual leakage, high leakage of magnetic flux at the installation position of vacuum equipment (up to 2000 gauss) and so on. The main vacuum system is designed as 9 sets of TMP with magnet shields installed on the valley of magnet poles, which also used as RF cavity.