CryoModel: a cryostat thermal performance simulation tool

In the design process of cryostats for accelerators equipment (magnets or RF cavities), it is of interest to estimate downtime for intervention. For this purpose, it is necessary to understand the temperature transients of the accelerator components during warm-up and cool-down processes. In this report, a mathematical model and a simulation tool to study the main heat transfer phenomena of a generic horizontal cryostat (radiation, with or without multilayer insulation system, actively cooled thermal shielding, thermal conduction through supporting systems, etc.) is presented. The thermal model and simulator have been benchmarked on experimental data from transients of the Large Hadron Collider (LHC). The presented tool is now being used to estimate the warm-up time needed for machine intervention in case of replacement of one cryomodule of the Superconducting Proton Linear accelerator (SPL).