Wiens Eugen, Schiller Stephan
Institut für Experimentalphysik, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany.
Rev Sci Instrum. 2021 Sep 1;92(9):095101. doi: 10.1063/5.0053381.
We present a system for passive damping of vibrations along three spatial degrees of freedom for cryostats equipped with closed-cycle coolers. The system, designed to isolate a payload of 30 kg, consists of two stages of isolation for vibrations in the vertical direction. The first isolation stage incorporates a trapezoidal beryllium copper cantilever blade. The second stage is attached to the blade via a steel wire and consists of four extension springs with an extended length of 370 mm. At 1.6 K, the stages possess vertical resonance frequencies of 2.1 and 1.3 Hz, respectively. The vertical length of the setup with a cumulative length of 580 mm also acts as a pendulum with a resonance frequency of 0.65 Hz. In the frequency band from 5 to 200 Hz, the frequency-integrated acceleration decreased from 6.7 × 10 to 4.3 × 10 g along the horizontal direction and from 4.3 × 10 to 7.2 × 10 g along the vertical direction. This corresponds to a reduction in vibrations by factors of 156 and 60, respectively. Overall, we achieve a simple, robust, and cost-efficient vibration isolation system for upgrading standard-type cryostats.
我们展示了一种用于配备闭环冷却器的低温恒温器的沿三个空间自由度被动阻尼振动的系统。该系统旨在隔离30千克的有效载荷，由垂直方向振动的两级隔振组成。第一级隔振采用梯形铍铜悬臂叶片。第二级通过钢丝连接到叶片上，由四个伸长长度为370毫米的拉伸弹簧组成。在1.6 K时，两级的垂直共振频率分别为2.1赫兹和1.3赫兹。累积长度为580毫米的装置的垂直长度也作为一个共振频率为0.65赫兹的摆。在5至200赫兹的频带内，水平方向的频率积分加速度从6.7×10降至4.3×10 g，垂直方向从4.3×10降至7.2×10 g。这分别对应于振动降低了156倍和60倍。总体而言，我们实现了一种用于升级标准型低温恒温器的简单、坚固且经济高效的隔振系统。
