Design and Development of a High-efficiency Encapsulation Platform for Beamline Tubes of Synchrotron Light Sources

The beamline tubes of synchrotron storage rings require protective encapsulation. This study developed a high-efficiency multi-channel beamline tube encapsulation platform. And the platform features a modular three-chamber design with high-vacuum gate valves, enabling flexible isolation and interconnection; it allows integrated pumping during commissioning and selective switching between evacuation and gas filling during encapsulation. The system supports simultaneous encapsulation of four beamline tubes per batch and employs a coordinated multi-pump vacuum configuration, effectively avoiding the frequent start-stop operations typical of conventional systems and enabling continuous high-efficiency encapsulation. Structural analyses under three representative operating conditions—evacuation, bake-out pumping, and inflation encapsulation—indicate a minimum safety margin of 15%, meeting ASME strength verification requirements. Leakage rates of the platform were further designed, and molecular flow simulations were conducted to evaluate its ultimate vacuum performance, which reaches 3.67×10⁻⁹ Pa, significantly exceeding the design target. This work provides a viable solution for efficient encapsulation of storage ring beamline tubes and offers valuable guidance for the design and development of ultra-high vacuum systems.