Abstract We report on the intrinsic mechanical vibrations and thermal oscillations of a small-scale two-stage pulse tube cryocooler operated by an inverter driven helium compressor. The combination offers a cooling power ranging from 35 to 156 mW at 4.0 K with an electric input power of 0.9 to 2.3 kW respectively. This system has been characterized with respect to mechanical and temperature stability. The acquired data from an accelerometer attached to the 2 n d stage of the cryocooler shows a longitudinal peak-to-peak displacement of a few tens of μ m. Additionally, temperature oscillations of a few hundred mK were found, with a maximum around 10.5 K. Based on this characterization, this article presents the reduction of these unwanted intrinsic effects by use of a compressor with variable operation modes.

中文翻译：

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由逆变氦压缩机驱动的低输入功率 4 K 脉冲管低温冷却器：固有温度振荡和机械振动

摘要 我们报告了由逆变器驱动的氦压缩机操作的小型两级脉冲管低温冷却器的固有机械振动和热振荡。该组合在 4.0 K 时提供 35 至 156 mW 的冷却功率，电输入功率分别为 0.9 至 2.3 kW。该系统的特点是机械和温度稳定性。从连接到低温冷却器第二级的加速度计获取的数据显示了几十微米的纵向峰峰值位移。此外，还发现了几百 mK 的温度振荡，最大值约为 10.5 K。基于此特征，本文介绍了通过使用具有可变操作模式的压缩机来减少这些不需要的内在影响。