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A simplified cryogenic optical resonator apparatus providing ultra-low frequency drift.

The Review of scientific instruments·2020

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Cryogenic Liquid Jets for High Repetition Rate Discovery Science

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A simple and efficient passive vibration isolation system for large loads in closed-cycle cryostats.

Eugen Wiens¹, Stephan Schiller¹

¹Institut für Experimentalphysik, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany.

The Review of Scientific Instruments

|October 2, 2021

Summary

This study introduces a passive vibration damping system for cryostats, significantly reducing horizontal and vertical vibrations. The cost-efficient design enhances performance for sensitive scientific instruments.

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Area of Science:

Cryogenics
Mechanical Engineering
Physics

Background:

Cryostats with closed-cycle coolers are susceptible to vibrations, impacting sensitive experiments.
Effective vibration isolation is crucial for maintaining optimal operating conditions in low-temperature environments.

Purpose of the Study:

To develop and present a passive vibration damping system for cryostats.
To achieve multi-directional vibration isolation for a 30 kg payload.

Main Methods:

The system utilizes two stages of vertical isolation, including a beryllium copper cantilever blade and extension springs.
A pendulum effect from the setup's vertical length provides additional low-frequency isolation.
The system was tested at 1.6 K, with resonance frequencies measured at 2.1 Hz, 1.3 Hz, and 0.65 Hz.

Main Results:

Achieved significant vibration reduction: 156-fold horizontally and 60-fold vertically in the 5-200 Hz band.
Frequency-integrated acceleration reduced from 6.7 × 10^-3 g to 4.3 × 10^-5 g (horizontal) and 4.3 × 10^-3 g to 7.2 × 10^-5 g (vertical).

Conclusions:

The developed system offers a simple, robust, and cost-efficient solution for vibration isolation in cryostats.
This passive damping system effectively upgrades standard cryostats for improved performance.