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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.
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.
