The Vacuum System of Arc Section Standard Cell for STCF Collider Rings

The Super Tau-Charm Facility (STCF) is a new-generation positron-electron collider planned in China. The core mission of STCF is to design a new generation of large-scale scientific facility featuring a center-of-mass energy between 2 and 7 GeV and a peak luminosity of more than 5×10^31 cm^–2s^–1. Given its high beam intensity and high luminosity characteristics. This will provide serious difficulties for the vacuum system’s design due to its high beam intensity and high luminosity features. The double-ring collider and the injector are the two primary components of the STCF. Each collider ring is divided into arcs, straight sections, and the interaction region. The arc sections adopt the same standard cell design. This paper primarily introduces the vacuum system of a standard cell for the arc section. This is related to the space simulation of aerospace on the ground, which requires a very high vacuum. By designing an overall scheme for the vacuum system, the structure and dimensions of the vacuum chamber are determined. The synchrotron radiation power and dynamic gas load distribution are calculated for the Arc Dipole Magnet. The placement scheme for vacuum components such as vacuum pumps, bellows, and BPMs is determined. At the same time, simulation analysis was conducted on the temperature, strength, and internal pressure of the vacuum chamber using finite element analysis software. Different vacuum chamber materials will have different calculation results, and the copper vacuum chamber is selected in this paper. The design specifications meet the technical requirements proposed by the physical system, providing a theoretical basis for the development of the next prototype and technical guidance for the design of vacuum systems in other sections.