Process design and calculation of DALS test facility cryogenic system using Ecosimpro

Abstract Dalian advanced light source (DALS) is a new Free Electron Laser (FEL) project based on SRF technology. The DALS test facility is used to test the key components of DALS, which requires a 370 W @ 2 K cryogenic system and is expected to be completed by end of this year. Dynamic simulation is often used in the cryogenic system process design, process calculation and control logic optimization. This paper introduces the establishment of cryogenic distribution system model, key components such as thermal shield, SRF cavity and cryomodule are modelled based on Ecosimpro platform. The safety relief model is also built for the dynamic relief process study. The dynamic cooldown process and safety relief process are simulated, the dynamic simulation software can be used to obtain more accurate process parameters in dynamic processes such as cooldown, safety relief, which is favourable for the design of cryogenic system and selection of components.