A liquid helium temperature target with two-stage internally finned cold shield heat exchanger for cylinder compression experiment

Abstract

The shock compression experiment of specimen at high-energy density state is an important way to get the state equation. The cryogenic technology is commonly used to get the high-energy density state which known as cryogenic target. This paper introduces a new kind of liquid helium cryogenic target for cylinder compression experiment. With two-stage internally finned heat exchanger cold shield and fold cold shield insulation structure, this target realizes the efficient storage of liquid helium and successfully developed the first domestic application in the liquid helium cryogenic target of cylinder compression experiment. The cavity can maintain the minimum temperature 4.77 K and keep stability for 32 min after move away the pump and helium Dewar which meet the requirement of cylinder loading experiment. This paper introduces the structure design of cryogenic target, thermal analysis with ANSYS Steady-Static Thermal module and experimental results of the target. The simulation results agree well with the experimental results.