介绍了高频脉冲管制冷机冷指无磁非金属材料的选择、加工以及实验优化工作。制作的高频无磁脉冲管制冷机冷指在风冷,2.3 MPa充气压力,44 Hz,70 W电功率输入条件下,最低达到73.4 K的无负荷最低温度;60 W电功率输入,最低温度为74.0 K,在80 K时可以提供0.1 W的制冷量。本文为高频脉冲管制冷机直接冷却相关低温超导器件提供了坚实的基础。
A nonmagnetic and nonmetallic pulse-tube cyrocooler(PTC) is fabricated and tested. The lowest no-load temperature of the cold head is 73.4 K by air-cooling with 44 Hz and 70 W input electric power.For an input electric power of 60 W,the cold finger can reach a no-load temperature of 74.0 K and provide an output power of 0.1 W at 80 K.