Note: Sub-Kelvin refrigeration with dry-coolers on a rotating system

Area of Science:

• Physics
• Engineering

Background:

• Achieving and maintaining sub-Kelvin temperatures is critical for advanced scientific research.
• Rotating platforms present unique challenges for cryogenic systems due to motion and vibration.

Purpose of the Study:

• To develop and test a novel cryogenic system capable of operating at sub-Kelvin temperatures on a rotating platform.
• To evaluate the performance and stability of the cryogenic system under continuous rotation.

Main Methods:

• Integration of a helium sorption cooler and a pulse tube cooler within a cryostat mounted on a rotating table.
• Utilization of rotary-joint connectors for seamless electricity and helium gas circulation.
• Performance testing including cool-down tests at 20 rpm and continuous monitoring over four weeks.

Main Results:

• The cryogenic system successfully achieved a temperature of 0.23 K.
• A holding time exceeding 24 hours was maintained, meeting catalog specifications.
• A minimal performance difference (few percent) was observed between rotating and non-rotating states.

Conclusions:

• The developed cryogenic system reliably achieves sub-Kelvin conditions on a rotating platform.
• The system's performance is stable and suitable for most scientific applications requiring low temperatures in motion.
• This technology offers a valuable solution for specialized scientific instrumentation on rotating setups.