回热材料Gd_2O_2S在液氦温区高频脉管制冷机的实验研究

EXPERIMENT STUDY ON REGENERATOR MATERIALS OF Gd_2O_2S IN HIGH FREQUENCY PULSE TUBE CRYOCOOLER WORKING AT LIQUID HELIUM TEMPERATURE

液氦温区高频脉冲管制冷机具有体积功耗小、质量轻、低振动等优点,因此在太赫兹通信、深空探测和空间科学实验等方面的应用具有独特的优势,是国内外深低温机械式制冷机的研究热点。而低温回热材料的性能是制约深低温制冷机发展的关键因素。利用实验室自主设计的液氦温区两级脉冲管制冷机及北京科技大学提供的Gd_2O_2S(GOS)材料,从填充长度等方面,对回热材料在液氦温区高频脉冲管制冷机的应用进行了实验研究。实验结果表明,在目前工况下,回热材料HoCu_2的实验效果是优于GOS,并对此做出了分析和解释。

The high frequency pulse tube cryocooler which can achieve 4.2 K(liquid helium temperature)has the advantage of low electromagnetic,light weight and small volume. It would be used in the field of THz communication,deep space exploration and space science experiments. At the same time,it is a hot research area in mechanical cryogenic refrigerator. The performance of regenerator materials has a vital influence on the development of cryogenic refrigerator. Based on the two-stage pulse tube cryocooler working at liquid helium temperature which is a independent self-design in our laboratory and the regenerator materials of Gd_2O_2S provided by University of Science and Technology Beijing,the paper shows a series of experiment studies which focus on the regenerator materials of GOS. The result of experiments points out that the regenerator materials of HoCu_2 is better than GOS under current conditions. And the phenomenon is specifically discussed in the paper.