In this paper, results of two kind two-stage pulse tube cooler driven by 55CC 16Hz valveless compressor are reported, and after continue improvement, 25K lowest temperature is got.

• 然后介绍了两种紧凑型结构的两级脉冲管制冷机实验结果。经过多次改进，发现了无阀型多级脉冲管的一些特性；实验得到了25K的最低温度。