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A continuous dry 300 mK cooler for THz sensing applications.

G M Klemencic¹, P A R Ade¹, S Chase²

¹School of Physics and Astronomy, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA, United Kingdom.

The Review of Scientific Instruments

|May 2, 2016

Summary

A novel cryostat design achieves continuous sub-300 mK temperatures using a closed-cycle system with minimal helium-3 gas. This economical solution offers long hold times for sensitive scientific instruments.

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Area of Science:

Low-temperature physics
Cryogenic engineering
Instrument development

Background:

Conventional single-shot sorption pumped (3)He cooling systems require gas recycling and have limited hold times.
Achieving ultra-low temperatures (sub-300 mK) is crucial for sensitive scientific measurements.

Purpose of the Study:

To describe and demonstrate the automated operation of a novel cryostat.
To present a closed-cycle, dry cryogenic system as an economical alternative for long-hold-time applications.

Main Methods:

Development and testing of a novel cryostat design.
Automated operation and performance evaluation under load.
Utilizing a minimal amount (5 L) of (3)He gas in a closed-cycle system.

Main Results:

Continuous base temperature below 300 mK was achieved without gas recycling.
A stable temperature of 365 mK was maintained with a 20 μW load.
The system demonstrated economical operation with a small volume of (3)He gas.

Conclusions:

The novel cryostat design offers a cost-effective and efficient solution for achieving and maintaining ultra-low temperatures.
The closed-cycle system eliminates the need for gas recycling, simplifying operation and extending hold times.
This technology is suitable for applications requiring stable, low-temperature environments, such as far-infrared camera cooling.