Thermal analysis and optimization of large liquid helium dewar leakage
In order to matain a reduced liquid helium evaportion rate,the overall structural design and heat leakage require-ments of the liquid helium Dewar are extremely high.The structural strength design and insulation system design method of Dewar with evaporating cold helium gas as the cold shield and cold source were established.The structural strength and heat leakage of liquid helium Dewar were systematically analyzed by using 3D modeling and simulation software for heat conduction and ther-mosolid coupling simulation analysis.The daily evaporation rate of 1.15％was realized with a volume of 4 000 L liquid helium dewar.It can provides a design idea for large liquid helium dewar with evaporating helium as cold shield.
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