Cryogenic cooling with cryocooler on a rotating system

TL;DR

This paper presents a novel cryogenic cooling system that maintains continuous operation on a rotating platform, enabling long-term stable cryogenic conditions for applications like radio astronomy and fundamental physics experiments.

Contribution

The authors developed an innovative interface system with rotary joints that allows a cryocooler to operate continuously on a rotating table, maintaining stable cryogenic temperatures.

Findings

System maintains cryogenic temperatures during rotation at 20 rpm.

Continuous cooling and temperature stability confirmed over long periods.

Applicable to various scientific fields including radio astronomy and fundamental physics.

Abstract

We developed a system that continuously maintains a cryocooler for long periods on a rotating table. A cryostat that holds the cryocooler is set on the table. A compressor is located on the ground and supplies high-purity (> 99.999%) and high-pressure (1.7 MPa) helium gas and electricity to the cryocooler. The operation of the cryocooler and other instruments requires the development of interface components between the ground and rotating table. A combination of access holes at the center of the table and two rotary joints allows simultaneous circulation of electricity and helium gas. The developed system provides two innovative functions under the rotating condition; cooling from room temperature and the maintenance of a cold condition for long periods. We have confirmed these abilities as well as temperature stability under a condition of continuous rotation at 20 revolutions per minute. The developed system can be applied in various fields; e.g., in tests of Lorentz invariance, searches for axion, radio astronomy and cosmology, and application of radar systems. In particular, there is a plan to use this system for a radio telescope observing cosmic microwave background radiation.