Dynamic simulation of DALS test facility cryogenic system

• The model includes both the cryoplant and the distribution system. • The cryoplant model incorporates most of the control loops and sequential control logic. • New components such as thermal shield and SRF cavity model are developed. • An automated cooldown method is proposed and implemented in the model. The Dalian Advanced Light Source (DALS) test facility requires a 370 W cryoplant to provide cooling for four test benches. Dynamic simulations are critical for optimizing process design, refining control strategies, and enhancing operational efficiency in large-scale cryogenic systems. This study develops a comprehensive dynamic simulation model of the DALS cryogenic system using EcosimPro, encompassing both the cryoplant and distribution system. The cryoplant model integrates key components, control loops, and sequential control strategies, validated through three operational modes with results showing strong agreement with experimental data. The cooldown process of the vertical test bench is validated against experimental data, demonstrating the model’s accuracy. Furthermore, an automated cooldown method with a controlled rate is proposed and successfully implemented, providing significant operational improvements. This model serves as a valuable tool for resolving operational challenges, optimizing system performance, and training future operators of cryogenic systems.