Production of Pressurized Superfluid Helium II by Directly Compressing Saturated Superfluid Helium II
Saturated superfluid He II (He IIs) was compressed by means of a bellows type He II compressor and pressurized superfluid He II (He Hp) was produced. Because the specific volume difference between He IIp at 1 bar and He IIs is of the order of 1%, a small compressor can be used to pressurize large volume of He lis in a chamber. In this study, a small size He II compression system was constructed and tested. The system consists of a bellows type He II compressor and a He IIp chamber which is connected to the compressor. The compressor is activated by a pneumatic cylinder at room temperature and is set in a He IIs bath. By the system, He IIs was compressed up to the pressure 1.48 bar and there is pulse like temperature rise which is only 0.02 K at the bath temperature of 1.8 K. Using the compressor, a He IIs - He IIp circulation system is proposed for magnet cooling.
KeywordsEnthalpy Helium Resis Gallium Gadolinium
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