Flow Process Analysis of the Cryogenic Distribution System for S3FEL Project

Shenzhen Superconducting Soft-X-ray Free Electron Laser (S3FEL) is located at Shenzhen, China. It is planned to construct a 2.5 GeV CW superconducting radio frequency linear accelerator and four beam lines, aiming at generating X-rays with a high repetition frequency. The accelerator consists of twenty-five 1.3 GHz cryomodules (CM) and two 3.9 GHz cryomodules, of which its SRF cavity need to be operated at 2 K condition. To maintain the 2 K environment, cryogenic distribution system (CDS) is designed to interconnect the CMs and the Cryoplant (CP) and supply cryogens from the CP to the LINAC. This paper presents the preliminary design result and current status of the CDS, which including overall specification and design consideration. In addition, a thermodynamic calculation is performed based on current design result. Those analyses provide sufficient evidence for the performance margin of the CDS design.