Abstract
The MCBRD magnets for the HL-LHC are now undergoing serial production in China and must be cold tested prior to shipment to CERN. To improve the efficiency and safety of the magnet, the pre-cooling procedure must be optimized. In this paper, A pre-cooler with continuous temperature control is designed, and a three-dimensional unstable CFD model of the magnet is developed in order to study the platform. In the model, a pre-cooler is employed to generate cold gaseous helium stream in order to cool the magnet. The helium is cooled by liquid nitrogen, circulated by a cryo-fan and supplemented by an electric heater for temperature regulation. The simulation yields the pre-cooling time and temperature distribution throughout the cooling operation. The results indicate that the MCBRD magnet can complete the pre-cooling stage in 72 hours with a maximum cooling rate of 6.92 K/h under the conditions of the pre-cooler's 1.8 kW cooling capacity and 60 K temperature difference. The cooling time is decreased by 37.9% compared to the previous indirect pre-cooling experiment, and the cooling process is stable and under control, with a maximum temperature difference of less than 30 K. This research aids in the formulation of an appropriate pre-cooling method for the early phase of magnet cold testing.
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