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Reducing current noise in cryogenic experiments by vacuum-insulated cables.

E Mykkänen¹, J S Lehtinen¹, A Kemppinen¹

¹VTT Technical Research Centre of Finland Ltd, Centre for Metrology MIKES, P.O. Box 1000, Espoo, 02044 VTT, Finland.

The Review of Scientific Instruments

|November 3, 2016

Summary

We reduced cryogenic cable current noise using vacuum-insulated cables in a dilution refrigerator. This method suppresses vibration-induced noise, achieving low millihertz white noise density and a peak below 4 fA.

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Area of Science:

Experimental physics
Cryogenics
Low-noise measurements

Background:

Current noise in cryogenic cables is a critical challenge for sensitive experiments.
Dilution refrigerators require extremely low noise environments for quantum measurements.

Purpose of the Study:

To quantify current noise in cryogenic cables within a dilution refrigerator.
To investigate methods for suppressing vibration-induced noise.
To achieve ultra-low noise levels for sensitive applications.

Main Methods:

Measured current noise of cryogenic cables across a frequency range of 1 mHz to 50 kHz.
Employed vacuum-insulated cables between room temperature and the second pulse tube stage.
Utilized a pulse tube based dilution refrigerator.

Main Results:

Demonstrated efficient suppression of vibration-induced noise using vacuum-insulated cables.
Achieved a noise peak below 4 fA at the 1.4 Hz pulse tube operation frequency.
Obtained a white noise density of 0.44 fA/Hz in the millihertz range.

Conclusions:

Vacuum-insulated cables are effective in mitigating vibration-induced current noise in cryogenic systems.
The implemented noise reduction strategy enables ultra-low noise performance in dilution refrigerators.
This work provides a pathway for improving signal-to-noise ratios in sensitive cryogenic experiments.